Prefabricated house is made of light steel as steel structure and sandwich panels for wall and roof. The sandwich panels can be polystyrene, polyurethane, rock wool and fiber glass sandwich panels for insulation. As a standardized construction product, it has below main features: Dry installation, no construction garbage caused; Environment protective materials adopted, repeated use and low cost; Flexible size and easy to assemble and disassemble with elegant appearance; Safe and durable. It is suitable for temporary buildings such as dormitory, canteen, recreation room, washing room, etc