diff --git a/httprunner/loader/check.py b/httprunner/loader/check.py
index 2f7720f4..5c0ca459 100644
--- a/httprunner/loader/check.py
+++ b/httprunner/loader/check.py
@@ -197,4 +197,8 @@ def is_testcase_path(path):
         if not os.path.exists(path):
             return False
 
+        file_suffix = os.path.splitext(path)[1].lower()
+        if file_suffix != ['.json', '.yaml', '.yml']:
+            return False
+
     return True