The invention discloses a spray cooling device used for a main transformer of a transformer station. The spray cooling device comprises a water source, a pressure pump, a water transmission pipe, a spraying device and a pressure pump control device. The spraying device comprises a horizontal spraying pipe and spraying nozzles. The spraying pipe is fixed with the main transformer on the half height position of the main transformer along arrangement direction of heat-radiating fins on the main transformer. The spraying nozzles are arranged in turn along the axial direction of the spraying pipe, and each spraying nozzle is exactly towards each heat-radiating fin on the main transformer so as to spray the heat-radiating fins. The pressure pump is provided with a water inlet hole and a water outlet hole. The water inlet hole of the pressure pump is connected with the water source. The first end part of the water transmission pipe is connected with the water outlet hole of the pressure pump. The second end part of the water transmission pipe is connected with the spraying pipe. The technical effects of the spray cooling device are that the spray cooling device has a great cooling effect on the main transformer of the transformer station, water consumption is low and energy consumption is low without corrosion of the heat-radiating fins on the main transformer of the transformer station.