Prefabricated box house is a modular building product based on steel frame and light wall panel structure system. This product adopts proprietary third-generation packing box technology, composed of top frame, bottom frame, corner post and interchangeable wall panels. It can be packaged, easy to install, and convenient for land or sea transportation. It can be used as an office, accommodation, restaurant, sanitary ware and combined large space use, which can meet the needs of construction site barracks, field work barracks, municipal resettlement houses and various commercial houses.