diff --git a/app/helpers.php b/app/helpers.php
index dac8d716..70892583 100644
--- a/app/helpers.php
+++ b/app/helpers.php
@@ -38,18 +38,6 @@ if (! function_exists('serial_number')) {
     }
 }
 
-if (! function_exists('serial_number')) {
-    /**
-     * 生成流水号
-     *
-     * @return string
-     */
-    function serial_number(): string
-    {
-        return date('YmdHis').sprintf('%06d', mt_rand(1, 999999));
-    }
-}
-
 if (! function_exists('trim_trailing_zeros')) {
     /**
      * 去除数字字符串小数点后多余的 0