Cryogenic energy saver

The cryogenic energy saver comprises a shell, a high-temperature pipe for high-temperature gas to pass through and a low-temperature pipe for low-temperature liquid to pass through are arranged in the shell, the high-temperature pipe and the low-temperature pipe are mutually independent, and at least part of the outer side wall of the high-temperature pipe abuts against the outer side wall of the low-temperature pipe. Therefore, the high-temperature gas passing through the high-temperature pipe exchanges heat with the low-temperature liquid passing through the low-temperature pipe. The copious cooling energy saver is applied to the constant-temperature dehumidification device, one end of the high-temperature pipe is connected with the high-temperature gas outlet end of the evaporator of the constant-temperature dehumidification device, the low-temperature pipe is connected with the low-temperature liquid outlet end of the air cooling heat exchanger of the constant-temperature dehumidification device, and thro