diff --git a/app/admin/controller/api/Upload.php b/app/admin/controller/api/Upload.php
index 91ee0c840..2f6848580 100644
--- a/app/admin/controller/api/Upload.php
+++ b/app/admin/controller/api/Upload.php
@@ -116,7 +116,7 @@ class Upload extends Controller
             $this->error('文件路径不能出现跳级操作！');
         }
         // 检查文件后缀是否被恶意修改
-        if (pathinfo(parse_url($saveName, PHP_URL_PATH), PATHINFO_EXTENSION) !== $extension) {
+        if (strtolower(pathinfo(parse_url($saveName, PHP_URL_PATH), PATHINFO_EXTENSION)) !== $extension) {
             $this->error('文件后缀异常，请重新上传文件！');
         }
         // 屏蔽禁止上传指定后缀的文件