NOVELTY - A multi-temperature refrigerator is prepared by connecting high pressure exhaust port of refrigerator compressor with condenser, condensing steam portion of mixed freezing medium in condenser, separating gas phase working substance of freezing medium, passing the liquid phase working substance in high-temperature room evaporator, condensing gas phase working substance, passing mixed working substance of non-azeotropic freezing medium in low-temperature room evaporator, mixing freezing medium, condensing, and passing in suction port of refrigeration compressor.    USE - Method of preparing a multi-temperature refrigerator.    ADVANTAGE - The method is easy to control, and is energy-saving.    DETAILED DESCRIPTION - A multi-temperature refrigerator comprising refrigeration compressor, a condenser, a gas-liquid separator, a condensing evaporator, a first throttle valve, a second throttle valve, a high-temperature room evaporator, a low-temperature room evaporator and a three-way flow rate distribution valve, is prepared by connecting high pressure exhaust port of the refrigerator compressor with the condenser, condensing steam portion of mixed freezing medium in the condenser causing the medium to be in gas-liquid phase and entering the gas-liquid separator, separating gas phase working substance of the freezing medium with low-b.pt. ingredient from high-b.pt. ingredient of liquid phase working substance, throttling with first throttle valve, passing the liquid phase working substance in high-temperature room evaporator, condensing gas phase working substance in the condensing evaporator, passing all the liquid in the second throttling valve, regulating temperature of the low-temperature room evaporator through the three-way flow rate distribution valve, passing the mixed working substance of the freezing medium with high-b.pt. ingredient in the low-temperature room evaporator, regulating temperature, mixing all freezing medium, then passing in condensing evaporator, absorbing heat, and passing suction port of refrigeration compressor.