diff --git a/extend/catcher/library/form/FormValidates.php b/extend/catcher/library/form/FormValidates.php
index 57ab31eaf33d27d49cb76b12277b248387bcddf0..59a35ea6102ff0ac3fa0c0c94f848b5391230af8 100644
--- a/extend/catcher/library/form/FormValidates.php
+++ b/extend/catcher/library/form/FormValidates.php
@@ -18,7 +18,7 @@ public static function validatePattern(string $pattern): Validate
     }
 
     /**
-     * 纯数字验证
+     * 纯字母验证
      *
      * @time 2021年03月12日
      * @return Validate
@@ -28,6 +28,17 @@ public static function validateAlpha(): Validate
         return self::validatePattern('^[A-Za-z]+$')->message('必须为纯字母');
     }
 
+    /**
+     * 纯数字验证
+     *
+     * @time 2022年03月31日
+     * @return Validate
+     */
+    public static function validateNum(): Validate
+    {
+        return self::validatePattern('^\d+$')->message('必须为纯数字');
+    }
+
     /**
      * 字母和数字
      *