A method of controlling an air-cooling device, the air-cooling device comprising: a cabinet; a liner which is mounted in the cabinet and whose internal cavity is partitioned into a first chamber and a second chamber; a first heating wire mounted in the first chamber; a second heating wire mounted in the second chamber; a single cycle refrigeration system comprising a circulation air passage, a compressor and an evaporator; a defrost sensor detecting defrost temperature is mounted on the evaporator; an evaporation blower mounted outside the liner; a first damper provided on the first chamber and connected to the circulation air passage; a second damper provided on the second chamber and connected to the circulation air passage; wherein the air-cooling device further comprises a compensatory heating wire disposed on a rear side of the evaporator; the controlling method comprises: when the first chamber does not meet its refrigeration requirement and the second chamber meets its refrigeration requirement, controlling the compressor and the evaporation blower to operate, opening the first damper and closing the second damper, and activating the second heating wire; controlling the compressor to stop and activating the compensatory heating wire when the first chamber reaches a preset refrigeration temperature, and closing the first damper and controlling the evaporation blower to stop after a delay after stopping the compressor until the defrost temperature reaches a first preset temperature; turning off the second heating wire when the second chamber meets a heating temperature; and opening the second damper and controlling the evaporation blower to operate when the defrost temperature reaches the second preset temperature after a delay after the first damper is closed, and controlling the evaporation blower to stop when the second chamber meets a heating temperature; the second preset temperature is higher than the first preset temperature. a cabinet; a liner which is mounted in the cabinet and whose internal cavity is partitioned into a first chamber and a second chamber; a first heating wire mounted in the first chamber; a second heating wire mounted in the second chamber; a single cycle refrigeration system comprising a circulation air passage, a compressor and an evaporator; a defrost sensor detecting defrost temperature is mounted on the evaporator; an evaporation blower mounted outside the liner; a first damper provided on the first chamber and connected to the circulation air passage; a second damper provided on the second chamber and connected to the circulation air passage; wherein the air-cooling device further comprises a compensatory heating wire disposed on a rear side of the evaporator; the controlling method comprises: when the first chamber does not meet its refrigeration requirement and the second chamber meets its refrigeration requirement, controlling the compressor and the evaporation blower to operate, opening the first damper and closing the second damper, and activating the second heating wire; controlling the compressor to stop and activating the compensatory heating wire when the first chamber reaches a preset refrigeration temperature, and closing the first damper and controlling the evaporation blower to stop after a delay after stopping the compressor until the defrost temperature reaches a first preset temperature; turning off the second heating wire when the second chamber meets a heating temperature; and opening the second damper and controlling the evaporation blower to operate when the defrost temperature reaches the second preset temperature after a delay after the first damper is closed, and controlling the evaporation blower to stop when the second chamber meets a heating temperature; the second preset temperature is higher than the first preset temperature. when the first chamber does not meet its refrigeration requirement and the second chamber meets its refrigeration requirement, controlling the compressor and the evaporation blower to operate, opening the first damper and closing the second damper, and activating the second heating wire; controlling the compressor to stop and activating the compensatory heating wire when the first chamber reaches a preset refrigeration temperature, and closing the first damper and controlling the evaporation blower to stop after a delay after stopping the compressor until the defrost temperature reaches a first preset temperature; turning off the second heating wire when the second chamber meets a heating temperature; and opening the second damper and controlling the evaporation blower to operate when the defrost temperature reaches the second preset temperature after a delay after the first damper is closed, and controlling the evaporation blower to stop when the second chamber meets a heating temperature; the second preset temperature is higher than the first preset temperature.