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The product structure is novel, and different types of structures can be combined horizontally and vertically according to the different needs of customers. The upper and lower floors have the same structure, and the wall and roof cannot be removed. The combination box is welded with standard steel and thin-walled steel plate bending parts to form a standard component, and its structure is simple and easy to install. The enclosure is composed of roof panels and wall panels. The roof panels and wall panels are assembled in the factory and the main structure forms an integrated unit. The roof panels are 0.376mm single-layer color steel plates. Paved with 50mm thermal insulation cotton, 0.426 mm color steel ceiling board, and 50 mm double-sided color steel sandwich panel for wall panels.