你可以这样得到它
$terms = get_terms("my_taxonomy");
$count = count($terms);
if ( $count > 0 )
{
    echo "<ul>";
    foreach ( $terms as $term ) 
    {
        echo "<li>" . $term->name . "</li>";
    }
    echo "</ul>";
 }
 否则你也可以这样使用
$term_slug = get_query_var( \'term\' );
$taxonomyName = get_query_var( \'taxonomy\' );
$current_term = get_term_by( \'slug\', $term_slug, $taxonomyName );
$args_list = array(
   \'taxonomy\' => \'item\', // or use $taxonomyName for all taxonomies
   \'show_count\' => true,
   \'hierarchical\' => true,
   \'child_of\' => $current_term->term_id,
   \'hide_empty\' => \'0\',
   \'title_li\' => \'\',
   \'echo\' => \'0\',
);
echo wp_list_categories($args_list);