多亏Thomas在StackOverflow回答了我的问题-https://stackoverflow.com/questions/53158606/remove-div-with-a-class-without-removing-content

下面是您如何在Wordpress for AMP上完成的。在您的主题中functions.php 添加以下内容：-

add_action( \'pre_amp_render_post\', \'amp_vid_rmv\' );
   function amp_vid_rmv() {
add_filter( \'the_content\', \'amp_vid_div_rmv\' );
} 
function amp_vid_div_rmv($content) {
   $content = preg_replace(\'#<div class="yt">([\\s\\S]*?)</div>#\', \'$1\', $content);
   return $content;
}

有时，您希望删除的不是html代码，而是短代码。然后使用类似的方法：

add_action( \'pre_amp_render_post\', \'amp_vid_rmv\' );
   function amp_vid_rmv() {
add_filter( \'the_content\', \'amp_vid_div_rmv\' );
} 
function amp_vid_div_rmv($content) {
  $content = preg_replace(\'#\\[shortcode_name_here\\]<br \\/>#\', \'$1\', $content);
   ?> <div>in func 9 </div> <?php 
   return $content;
}