The utility model relates to a heat transfer medium's drying -machine is regarded as with nitrogen gas, including nitrogen cylinder, heat collector and drying chamber, between nitrogen cylinder and the heat collector air inlet, between heat collector gas outlet and the drying chamber air inlet, set up the gas passage between drying chamber air inlet and the nitrogen cylinder be provided with the valve on the gas passage. The disclosed heat transfer medium's drying -machine is regarded as with nitrogen gas of this application, combine the unique solar energy resource advantage in xinjiang, utilize nitrogen gas to realize the heating to the fruit as heating medium in an inclosed space simultaneously, when avoiding using air heating, oxygen in the air is to the oxidation of fruit, change the color and luster of fruit, reduce the quality of fruit, regard as solar drying technique and nitrogen gas heating medium jointly to use the dry field of fruit, can solve the dry problem that exists of nature sunning, improve the quality of dry fruit.