您必须使用wp\\u查询获取除当前帖子外的所有帖子，然后循环浏览并输出其缩略图。

类似这样的东西（应该有效，但未经测试）

<?php
//Set the current page id
$current_id = get_the_id();

// Get all posts of a post type but the current post
$the_query = new WP_Query( array(
    \'post_type\' => \'your-post-type\',
    //\'post__not_in\' => array( get_the_id() ), Removed to include current post
    \'posts_per_page\'=>-1
) );

// The Loop
if ( $the_query->have_posts() ) {
    echo \'<ul>\';
    while ( $the_query->have_posts() ) {
        $the_query->the_post();
        if( $current_id  == get_the_id() ){
            $current = \'active\';
        } else {
            $current = \'\';
        }
        echo \'<a class="\'.$current.\'" href="\'.get_permalink( get_the_id() ).\'">\';
        echo get_the_post_thumbnail( get_the_id() );
        echo \'</a>\';
    }
    echo \'</ul>\';
} else {
    // no posts found
}

// Restore original Post Data
wp_reset_postdata();
?>

EDIT: added \'posts_per_page\'=>-1 to the query args

EDIT2: Show the current post with a class of active