diff --git a/install.sh b/install.sh
index e6e38ee..183958e 100644
--- a/install.sh
+++ b/install.sh
@@ -3544,6 +3544,22 @@ update_main() {
     update_pull_latest_code
 
     # 更新依赖
+
+    # 检查并重新下载上传工具（如果需要）
+    if [[ ! -f "${PROJECT_DIR}/upload-tool/dist/玩玩云上传工具.exe" ]]; then
+        print_info "检测到上传工具丢失，正在重新下载..."
+        build_upload_tool
+    else
+        FILE_SIZE=$(stat -f%z "${PROJECT_DIR}/upload-tool/dist/玩玩云上传工具.exe" 2>/dev/null || stat -c%s "${PROJECT_DIR}/upload-tool/dist/玩玩云上传工具.exe" 2>/dev/null || echo "0")
+        if [[ $FILE_SIZE -lt 30000000 ]]; then
+            print_warning "上传工具文件大小异常，正在重新下载..."
+            rm -f "${PROJECT_DIR}/upload-tool/dist/玩玩云上传工具.exe"
+            build_upload_tool
+        else
+            FILE_SIZE_MB=$(( FILE_SIZE / 1024 / 1024 ))
+            print_success "上传工具完整（${FILE_SIZE_MB}MB）"
+        fi
+    fi
     update_install_dependencies
 
     # 迁移数据库配置