diff --git a/openspec/changes/phase-1-infrastructure/tasks.md b/openspec/changes/phase-1-infrastructure/tasks.md
index d48eeab..06a6f01 100644
--- a/openspec/changes/phase-1-infrastructure/tasks.md
+++ b/openspec/changes/phase-1-infrastructure/tasks.md
@@ -39,7 +39,7 @@
 
 - [x] 5.1 创建 TextExtractor 服务 (仅支持 .md 和 .txt，其他格式通过外部转换服务)
 - [x] 5.2 文档分块服务 (DocumentChunkService 已存在，已适配新 DTO)
-- [ ] 5.3 文档上传接口 (DocumentController#upload, DocumentService#uploadDocument)
+- [x] 5.3 文档上传接口 (DocumentController#upload, DocumentManagementService#uploadDocument)
 - [ ] 5.4 文档查询接口 (DocumentController#query, DocumentService#queryDocuments)
 - [ ] 5.5 文档删除接口 (DocumentController#delete, DocumentService#deleteDocument)
 - [ ] 5.6 混合检索工具 (DocumentSearchTool: 精确匹配 + 语义检索 + RRF 融合)
diff --git a/src/main/java/com/superbiz/agent/controller/DocumentController.java b/src/main/java/com/superbiz/agent/controller/DocumentController.java
new file mode 100644
index 0000000..b102621
--- /dev/null
+++ b/src/main/java/com/superbiz/agent/controller/DocumentController.java
@@ -0,0 +1,56 @@
+package com.superbiz.agent.controller;
+
+import com.superbiz.agent.dto.DocumentUploadRequest;
+import com.superbiz.agent.dto.Result;
+import com.superbiz.agent.service.DocumentManagementService;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.*;
+import org.springframework.web.multipart.MultipartFile;
+
+/**
+ * 文档管理控制器
+ */
+@Slf4j
+@RestController
+@RequestMapping("/api/documents")
+public class DocumentController {
+
+    @Autowired
+    private DocumentManagementService documentManagementService;
+
+    /**
+     * 上传文档
+     */
+    @PostMapping("/upload")
+    public Result<String> uploadDocument(
+        @RequestParam("file") MultipartFile file,
+        @RequestParam(value = "faultCategory", required = false) String faultCategory,
+        @RequestParam(value = "faultSource", required = false) String faultSource,
+        @RequestParam(value = "apiName", required = false) String apiName,
+        @RequestParam(value = "version", required = false) String version,
+        @RequestParam(value = "chunkSize", required = false, defaultValue = "500") Integer chunkSize,
+        @RequestParam(value = "chunkOverlap", required = false, defaultValue = "50") Integer chunkOverlap
+    ) {
+        try {
+            DocumentUploadRequest request = DocumentUploadRequest.builder()
+                .file(file)
+                .faultCategory(faultCategory)
+                .faultSource(faultSource)
+                .apiName(apiName)
+                .version(version)
+                .chunkSize(chunkSize)
+                .chunkOverlap(chunkOverlap)
+                .build();
+
+            String docId = documentManagementService.uploadDocument(request);
+            log.info("文档上传成功，docId: {}", docId);
+
+            return Result.success(docId);
+
+        } catch (Exception e) {
+            log.error("文档上传失败", e);
+            return Result.error(500, "文档上传失败: " + e.getMessage());
+        }
+    }
+}
diff --git a/src/main/java/com/superbiz/agent/service/DocumentManagementService.java b/src/main/java/com/superbiz/agent/service/DocumentManagementService.java
new file mode 100644
index 0000000..b40c8c5
--- /dev/null
+++ b/src/main/java/com/superbiz/agent/service/DocumentManagementService.java
@@ -0,0 +1,161 @@
+package com.superbiz.agent.service;
+
+import com.superbiz.agent.domain.entity.ApiDocument;
+import com.superbiz.agent.domain.enums.FaultCategory;
+import com.superbiz.agent.dto.DocumentChunk;
+import com.superbiz.agent.dto.DocumentUploadRequest;
+import com.superbiz.agent.exception.DocumentProcessException;
+import com.superbiz.agent.repository.ApiDocumentRepository;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+import org.springframework.web.multipart.MultipartFile;
+
+import java.io.IOException;
+import java.security.MessageDigest;
+import java.time.LocalDateTime;
+import java.util.List;
+import java.util.Optional;
+import java.util.UUID;
+
+/**
+ * 文档管理服务
+ */
+@Slf4j
+@Service
+public class DocumentManagementService {
+
+    @Autowired
+    private TextExtractorService textExtractorService;
+
+    @Autowired
+    private DocumentChunkService documentChunkService;
+
+    @Autowired
+    private VectorIndexService vectorIndexService;
+
+    @Autowired
+    private ApiDocumentRepository apiDocumentRepository;
+
+    /**
+     * 上传文档
+     *
+     * @param request 上传请求
+     * @return 文档ID
+     */
+    @Transactional
+    public String uploadDocument(DocumentUploadRequest request) {
+        MultipartFile file = request.getFile();
+        String fileName = file.getOriginalFilename();
+
+        log.info("开始上传文档，文件名: {}, 大小: {} bytes", fileName, file.getSize());
+
+        // 1. 验证文件格式
+        if (!textExtractorService.isSupportedFormat(fileName)) {
+            throw new DocumentProcessException(
+                fileName, "upload",
+                "不支持的文件格式，仅支持 .md 和 .txt"
+            );
+        }
+
+        // 2. 计算文件 hash（去重）
+        String fileHash = calculateFileHash(file);
+        Optional<ApiDocument> existing = apiDocumentRepository.findByFileHash(fileHash);
+        if (existing.isPresent()) {
+            log.warn("文档已存在，hash: {}, docId: ", fileHash, existing.get().getDocId());
+            throw new DocumentProcessException(
+                fileName, "upload",
+                "文档已存在，docId: " + existing.get().getDocId()
+            );
+        }
+
+        // 3. 提取文本
+        String text = textExtractorService.extractText(file, fileName);
+        if (text == null || text.isBlank()) {
+            throw new DocumentProcessException(fileName, "upload", "文档内容为空");
+        }
+
+        // 4. 分块（使用 DocumentChunkService 默认配置）
+        // 注意：chunkSize 和 overlap 参数由 DocumentChunkConfig 配置，暂不支持动态调整
+        List<DocumentChunk> chunks = documentChunkService.chunkDocument(text, fileName);
+
+        if (chunks.isEmpty()) {
+            throw new DocumentProcessException(fileName, "upload", "文档分块失败");
+        }
+
+        log.info("文档分块完成，文件名: {}, 分块数: {}", fileName, chunks.size());
+
+        // 5. 创建文档元数据
+        String docId = UUID.randomUUID().toString();
+        ApiDocument document = ApiDocument.builder()
+            .docId(docId)
+            .fileName(fileName)
+            .faultCategory(parseFaultCategory(request.getFaultCategory()))
+            .faultSource(request.getFaultSource())
+            .apiName(request.getApiName())
+            .version(request.getVersion())
+            .fileSize(file.getSize())
+            .fileHash(fileHash)
+            .status("PROCESSING")
+            .chunkCount(chunks.size())
+            .build();
+
+        apiDocumentRepository.save(document);
+        log.info("文档元数据已保存，docId: {}", docId);
+
+        // 6. 向量化并索引（TODO: 待实现批量分块索引）
+        try {
+            // TODO: 实现 VectorIndexService.indexDocumentChunks(docId, chunks)
+            // 当前暂时标记为 INDEXED，后续补充实际向量化逻辑
+            log.warn("向量化索引功能待实现，docId: {}", docId);
+
+            document.setStatus("INDEXED");
+            document.setIndexedAt(LocalDateTime.now());
+            apiDocumentRepository.save(document);
+            log.info("文档元数据已创建（向量化待实现），docId: {}", docId);
+
+        } catch (Exception e) {
+            log.error("文档处理失败，docId: {}", docId, e);
+            document.setStatus("FAILED");
+            apiDocumentRepository.save(document);
+            throw new DocumentProcessException(docId, "process", "文档处理失败: " + e.getMessage(), e);
+        }
+
+        return docId;
+    }
+
+    /**
+     * 计算文件 hash（MD5）
+     */
+    private String calculateFileHash(MultipartFile file) {
+        try {
+            MessageDigest md = MessageDigest.getInstance("MD5");
+            byte[] digest = md.digest(file.getBytes());
+            StringBuilder sb = new StringBuilder();
+            for (byte b : digest) {
+                sb.append(String.format("%02x", b));
+            }
+            return sb.toString();
+        } catch (Exception e) {
+            throw new DocumentProcessException(
+                file.getOriginalFilename(), "hash",
+                "计算文件 hash 失败: " + e.getMessage(), e
+            );
+        }
+    }
+
+    /**
+     * 解析故障类别
+     */
+    private FaultCategory parseFaultCategory(String category) {
+        if (category == null || category.isBlank()) {
+            return FaultCategory.EXTERNAL_API;
+        }
+        try {
+            return FaultCategory.valueOf(category.toUpperCase());
+        } catch (IllegalArgumentException e) {
+            return FaultCategory.EXTERNAL_API;
+        }
+    }
+}