您可以使用wp_list_categories 为了实现这一目标：

<ul>
    <?php
        wp_list_categories( array(
            \'child_of\' => <PARENT_ID>, // show only children of PARENT_ID
            \'childless\' => true, // show only categories without children
            \'hide_empty\' => true, // should empty categories be hidden
        ) );
    ?> 
</ul>