diff --git a/src/dialog/dialog-v2.jsx b/src/dialog/dialog-v2.jsx
index 48dadba127..ee0bc07a07 100644
--- a/src/dialog/dialog-v2.jsx
+++ b/src/dialog/dialog-v2.jsx
@@ -54,6 +54,7 @@ const Dialog = props => {
         minMargin,
         onClose,
         style,
+        wrapperClassName,
         ...others
     } = props;
 
@@ -238,6 +239,7 @@ const Dialog = props => {
 
     const wrapperCls = classNames({
         [`${prefix}overlay-wrapper`]: true,
+        [`${wrapperClassName}`]: !!wrapperClassName,
         opened: visible,
     });
     const dialogCls = classNames({
diff --git a/src/dialog/dialog.jsx b/src/dialog/dialog.jsx
index e1aab4271d..28cfce0da3 100644
--- a/src/dialog/dialog.jsx
+++ b/src/dialog/dialog.jsx
@@ -167,6 +167,11 @@ export default class Dialog extends Component {
          * @version 1.25
          */
         overflowScroll: PropTypes.bool,
+        /**
+         * [v2] 最外包裹层 className
+         * @version 1.26
+         */
+        wrapperClassName: PropTypes.string,
         /**
          * [废弃]同closeMode, 控制对话框关闭的方式，值可以为字符串或者布尔值，其中字符串是由以下值组成：
          * **close** 表示点击关闭按钮可以关闭对话框