Abstract: The ZLF-400 mobile refrigeration device with magnetic coupling is studied through the whole design of permanent magnet speed regulating mobile refrigeration unit. In the experimental site where the temperature is constantly changed, when the temperature parameter is not set, the cooling temperature will automatically adjust to the curing temperature. If it is necessary to change the temperature, alter the temperature parameters on the controller, the controller will send a command to the actuator of the variable speed type magnet coupling to change the air gap, thereby adjusting the speed of the compressor and the fan motor to change the refrigeration temperature. Under the same conditions, the power consumption per hour of equipment is increased obviously without the magnetic coupling control motor to do the same refrigeration test. The test results show that the cooling equipment, the cooling temperature and the air quantity are suitable and the energy consumption is low, which greatly saves the cost of electricity consumption and increases the comfort level of the staff.