The disclosure relates to the field of logistics technology, and discloses an order processing method and device, a storage system, and a computer storage medium. The method includes: obtaining the information of each order among the multiple orders to be processed and the busyness of the site corresponding to each order, the information of each order including: the number of sites corresponding to each order, the picking distance and the number of item categories ; According to the information of each order and the busyness of the site corresponding to each order, determine some orders from the plurality of pending orders to form a target order group. This disclosure comprehensively considers the number of stations, picking distance, item category and station busyness corresponding to each order in multiple pending orders, so as to determine the coincidence degree of stations among the orders in the target order group High, high overlap of picking routes, high similarity of included item categories, and low site busyness. Based on this target order group, the order processing efficiency per unit time can be improved.