The box body of this series of prefabricated substation mainly includes a base, side panels, clapboards, doors, roof and other components. In the box, there are a high-voltage room, a transformer room and a low-voltage room. The protection class of cabinet is IP33. The seal, clapboard, door and roof above the base plate are made of cold-rolled steel sheet, welded or fastened together so as to get sufficient mechanical strength. The inner and outer surfaces of the box components are sprayed to form a durable protective layer. The box body is raintight, sun-resistant, antirust and ventilated, which is the most advanced structure both at home and abroad.