External ice-melting type ice cold-storage refrigerating system

An external ice-melting type ice cold-storage refrigerating system relates to the technical field of refrigeration air-conditioning and comprises a refrigerating unit, end equipment, an ice making unit, a heat exchange device and an ice storage tank, wherein a heat exchanger is arranged in the ice storage tank; an evaporator of the ice making unit is in loop connection with the heat exchanger in the ice storage tank through a pipeline, and the ice storage tank is in loop connection with a cold fluid channel of the heat exchange device through a pipeline; a hot fluid channel in the heat exchange device is in loop connection with the end equipment through a pipeline; and a pipeline is arranged between a condenser of the ice making unit and the evaporator of the refrigerating unit in a loop manner, and a corresponding circulating pump and a control valve are arranged on the pipeline. The cooling water for the condenser of the refrigerating unit is pre-refrigerated by the refrigerating unit to reach the temperatu