The refrigerator is mainly composed of a box electric heating element, a thermostat, a timer and a power adjustment switch. Its box body is mainly composed of a three-layer structure of shell, middle compartment and inner tank, forming a curled edge on the front and rear edges of the inner tank to isolate the cavity air; The outer cavity is filled with insulated expanded perlite products, so that the shell temperature is greatly reduced; At the same time, a spring structure is installed under the door, so that the door is always pressed on the door frame to make it have better sealing.