It is applicable to the electric control cabinet of CNC machine tools. The internal heating capacity of the electric control cabinet is relatively large, and the heating elements in the cabinet need to be cooled, so that the equipment can work normally without failure. Portable, safe, efficient, active refrigeration, can automatically return to the original working parameters after power off and restart, can choose non condensing water type air conditioner, reduce environmental pollution, long service life, stable operation. The shell adopts cold plate, with small proportion space, AC 220V or DC 48V optional