diff --git a/packages/components/input/src/utils.ts b/packages/components/input/src/utils.ts
index ffed2ef5a3..dd32e60800 100644
--- a/packages/components/input/src/utils.ts
+++ b/packages/components/input/src/utils.ts
@@ -70,7 +70,7 @@ export function calcTextareaHeight(
 ): TextAreaHeight {
   if (!hiddenTextarea) {
     hiddenTextarea = document.createElement('textarea')
-    document.body.appendChild(hiddenTextarea)
+    ;(targetElement.parentNode ?? document.body).appendChild(hiddenTextarea)
   }
 
   const { paddingSize, borderSize, boxSizing, contextStyle } =