diff --git a/web/app/components/base/html-preview-button/index.tsx b/web/app/components/base/html-preview-button/index.tsx
new file mode 100644
index 0000000000..b56b12f955
--- /dev/null
+++ b/web/app/components/base/html-preview-button/index.tsx
@@ -0,0 +1,74 @@
+import React from 'react'
+import FullScreenModal from '@/app/components/base/fullscreen-modal'
+import cn from '@/utils/classnames'
+import s from './style.module.css'
+import { useTranslation } from 'react-i18next'
+import ActionButton from '../action-button'
+import Tooltip from '../tooltip'
+
+type HTMLPreviewBtnProps = {
+  content: string,
+  completed?: boolean,
+}
+
+const prefixPreview = 'appOverview.overview.appInfo.preview'
+
+type CreateIframeModalProps = {
+  show: boolean,
+  onClose: () => void,
+  content: string,
+}
+
+const CreateIframeModal = ({ show, onClose, content }: CreateIframeModalProps) => {
+  const { t } = useTranslation()
+  return (
+    <FullScreenModal
+      overflowVisible
+      closable
+      open={show}
+      onClose={onClose}
+    >
+      <iframe
+        srcDoc={content}
+        sandbox="allow-scripts"
+        title={t(`${prefixPreview}`)}
+        style={{ width: '100%', height: '100%', border: 'none' }}
+      />
+    </FullScreenModal>
+  )
+}
+
+const HTMLPreviewBtn = ({
+  content,
+  completed = false,
+}: HTMLPreviewBtnProps) => {
+  const { t } = useTranslation()
+  const [show, setShow] = React.useState(false)
+
+  const openModal = () => {
+    setShow(true)
+  }
+  const closeModal = () => {
+    setShow(false)
+  }
+
+  if (!completed) return null
+
+  return (
+    <>
+      <Tooltip
+        popupContent={t(`${prefixPreview}`)}>
+        <ActionButton onClick={openModal}>
+          <div className={cn('h-4 w-4', s.previewIcon)}></div>
+        </ActionButton>
+      </Tooltip>
+      <CreateIframeModal
+        show={show}
+        onClose={closeModal}
+        content={content}
+      />
+    </>
+  )
+}
+
+export default HTMLPreviewBtn
diff --git a/web/app/components/base/html-preview-button/style.module.css b/web/app/components/base/html-preview-button/style.module.css
new file mode 100644
index 0000000000..50d57167fa
--- /dev/null
+++ b/web/app/components/base/html-preview-button/style.module.css
@@ -0,0 +1,5 @@
+.previewIcon {
+  background-image: url(~@/app/components/develop/secret-key/assets/play.svg);
+  background-position: center;
+  background-repeat: no-repeat;
+}
diff --git a/web/app/components/base/markdown.tsx b/web/app/components/base/markdown.tsx
index ca2ec72791..b3ed679c99 100644
--- a/web/app/components/base/markdown.tsx
+++ b/web/app/components/base/markdown.tsx
@@ -16,6 +16,7 @@ import { flow } from 'lodash-es'
 import ActionButton from '@/app/components/base/action-button'
 import CopyIcon from '@/app/components/base/copy-icon'
 import SVGBtn from '@/app/components/base/svg'
+import HTMLPreviewBtn from '@/app/components/base/html-preview-button'
 import Flowchart from '@/app/components/base/mermaid'
 import ImageGallery from '@/app/components/base/image-gallery'
 import { useChatContext } from '@/app/components/base/chat/chat/context'
@@ -29,6 +30,7 @@ import { Theme } from '@/types/app'
 import useTheme from '@/hooks/use-theme'
 import cn from '@/utils/classnames'
 import SVGRenderer from './svg-gallery'
+import { getPureContent, isCompleteHTML } from './utils'
 
 // Available language https://github.com/react-syntax-highlighter/react-syntax-highlighter/blob/master/AVAILABLE_LANGUAGES_HLJS.MD
 const capitalizationLanguageNameMap: Record<string, string> = {
@@ -191,14 +193,17 @@ const CodeBlock: any = memo(({ inline, className, children = '', ...props }: any
   if (inline || !match)
     return <code {...props} className={className}>{children}</code>
 
+  const pureCode = getPureContent(children)
+
   return (
     <div className='relative'>
       <div className='flex h-8 items-center justify-between rounded-t-[10px] border-b border-divider-subtle bg-components-input-bg-normal p-1 pl-3'>
         <div className='system-xs-semibold-uppercase text-text-secondary'>{languageShowName}</div>
         <div className='flex items-center gap-1'>
           {(['mermaid', 'svg']).includes(language!) && <SVGBtn isSVG={isSVG} setIsSVG={setIsSVG} />}
+          {(['html']).includes(language!) && <HTMLPreviewBtn content={pureCode} completed={isCompleteHTML(pureCode)} />}
           <ActionButton>
-            <CopyIcon content={String(children).replace(/\n$/, '')} />
+            <CopyIcon content={pureCode} />
           </ActionButton>
         </div>
       </div>
diff --git a/web/app/components/base/utils.ts b/web/app/components/base/utils.ts
new file mode 100644
index 0000000000..53bcfa4857
--- /dev/null
+++ b/web/app/components/base/utils.ts
@@ -0,0 +1,9 @@
+export const isCompleteHTML = (code: string): boolean => {
+  // simple check
+  const completeHTMLRegex = /<\s*html\s*[^>]*>[\s\S]*<\/html\s*>/i
+  return completeHTMLRegex.test(code)
+}
+
+export const getPureContent = (code: string): string => {
+  return String(code).replace(/\n$/, '').trim()
+}