Through the inlet valve, the water automatically enters a water storage tank, and then pumps water to the diverter tube. The diverter tube uniformly flows the water to the evaporator cooled by the low-temperature liquid refrigerant, and the water is cooled to the freezing point, which is cooled to the freezing point. The water will solidify into ice, and the water that has not been frozen by the evaporator flows into the water reservoir again, and the circulation is resumed by the water pump. When the ice cube reaches the required thickness, it enters the deicing state, and the high pressure hot gas discharged from the compressor is led to the evaporator through the reversing valve to replace the low temperature liquid refrigerant. Thus, a water film is formed between the ice cube and the evaporator, and the water film separates the ice cubes from the evaporator, and the ice cubes fall freely into the ice storage tank by gravity.