有一个动作叫做trashed_post_comments 在注释设置为post-trashed 地位你可以加入其中：

add_action( \'trashed_post_comments\', \'wpse134528_really_trash_comments\' );
function wpse134528_really_trash_comments( $post_id ) {
    $args = array( 
        \'post_id\' => $post_id,
        \'status\' => \'post-trashed\',
    );
    $comments = get_comments( $args );
    foreach( $comments as $comment ) {
        wp_trash_comment( $comment->comment_id );
    }
}