The ice maker automatically enters a water storage tank through a makeup water valve, and then the water is pumped through a flow control valve to the diversion head. There, the water is evenly sprayed onto the surface of the ice maker, flowing like a water curtain through the wall of the ice maker. The water is cooled to the freezing point, while the water that has not been evaporated and frozen will flow into the storage tank through a multi hole tank, restarting the cycle work.