wp_insert_term() 对这类事情很管用。

您没有给出任何上下文，但这里有一个我制作的快速示例，在每次页面加载时，都会从MY 媒体库（更改$existing_image_ids 到您自己的ID，以使其工作）。

// page load creates a random product category, and an associated image
add_action( \'init\', \'rand_product_cat_w_rand_image\' );
function rand_product_cat_w_rand_image() {

    $test_product_cats = [
        \'Test Category 1\',
        \'Test Category 2\',
        \'Test Category 3\',
        \'Test Category 4\',
        \'Test Category 5\'
    ];

    $existing_image_ids = [
        \'144\',
        \'143\',
        \'142\',
        \'141\',
        \'140\'
    ];

    $rand_cat = rand( 0, 4 );
    $rand_img = rand( 0, 4 );

    $new_cat_title = $test_product_cats[$rand_cat]; // title of product category
    $new_img_id = $existing_image_ids[$rand_img]; // id of image you want to use from your media library

    $new_cat_added = wp_insert_term( $new_cat_title, \'product_cat\' ); // \'product_cat\' is woocommerce product category taxonomy, and were adding a new category with title

    if(is_wp_error( $new_cat_added )) {
        return; // there was an error adding new product category, usually because it already exists with only 5 available test categories
    }
    else {
        add_term_meta( $new_cat_added[\'term_id\'], \'thumbnail_id\', $new_img_id, true ); // add image to new product category, etc.
    }    
}

// This bit is just copied from WooCommerce docs for showing product category image:
// REF: https://docs.woocommerce.com/document/woocommerce-display-category-image-on-category-archive/
add_action( \'woocommerce_archive_description\', \'woocommerce_category_image\', 2 );
function woocommerce_category_image() {
    if ( is_product_category() ){
        global $wp_query;
        $cat = $wp_query->get_queried_object();
        $thumbnail_id = get_woocommerce_term_meta( $cat->term_id, \'thumbnail_id\', true );
        $image = wp_get_attachment_url( $thumbnail_id );
        if ( $image ) {
            echo \'<img src="\' . $image . \'" alt="\' . $cat->name . \'" />\';
        }
    }
}