Freeze melting device with independent pre-cooling device

The utility model relates to a freeze melting device with an independent pre-cooling device. A high pressure gas inlet pipeline is connected with a gas heat exchanger of the pre-cooling device via a gas inlet electromagnetic valve; output is divided into two paths and connected with a heating gas inlet pipeline and a refrigerating gas inlet pipeline respectively via a heating electromagnetic valve and a refrigerating electromagnetic valve; output of a semi-conductor refrigerating plate of the pre-cooling device is connected with a low pressure gas returning pipeline; the refrigerating gas inlet pipeline, the heating gas inlet pipeline, the low pressure gas returning pipeline and a thermoelectric couple are coaxially placed inside a heat preservation sleeve; thermoelectric signals of the thermoelectric couple are inputted into a microcomputer via a temperature signal acquisition module; and the microcomputer outputs control signals after acquiring the temperature signals to control the pre-cooling device, a ga