The utility model discloses a portable transformer substation uses wireless network relay, the device comprises a device body, the plastic width -lock type single -layer sealed packing case comprises a casin, the connecting block, hand -carrying rod, wireless network relay, the power modul, high -power AP, wireless router, the control room, the canyon, place outside relay cell and the transformer substation, the outside of device body is provided with the box, the surface of box is provided with the connecting block, the top of connecting block is provided with hand -carrying rod, the inside of device body is provided with wireless network relay, wireless network relay's inside is provided with power module respectively, high -power AP and wireless router. The device enlargies the information that wireless router received, gain through high -power AP to be satisfied with the wireless transmission's of big data message in the transformer substation efficiency, satisfied user's demand.