High/low voltage prefabricated substation is a full enclosed steel frame box shell structure with polystyrene board box type transformer shell. It has strong corrosion resistance, good waterproof performance, and good heat dissipation effect. It has a small volume, compact structure, small footprint, can penetrate deep into the load center, reduce line losses, and improve power supply quality; Quick installation, easy maintenance, safe and reliable operation, and other characteristics.