An air conditioner defrosting control method: setting a target discharge temperature of a compressor and an initial opening degree of a throttle device when an air conditioner performs defrosting according to an outdoor ambient temperature when the air conditioner meets a defrosting condition and enters a defrosting mode; controlling a defrosting operation of the air conditioner according to the target discharge temperature of the compressor and the initial opening degree of the throttle device; and controlling the air conditioner to exit the defrosting mode when a temperature of an outdoor heat exchanger of the air conditioner reaches a set temperature value; characterised in that the controlling of the defrosting operation of the air conditioner according to the target discharge temperature of the compressor and the initial opening degree of the throttle device comprises: controlling the throttle device of the air conditioner to open to the initial opening degree; controlling the throttle device to increase an opening degree of the throttle device by a first preset opening degree at intervals of a second preset time after a first preset time elapses; and adjusting the opening degree of the throttle device according to a discharge temperature of the compressor and the target discharge temperature after the opening degree of the throttle device is increased to a sum of the initial opening degree and a second preset opening degree. setting a target discharge temperature of a compressor and an initial opening degree of a throttle device when an air conditioner performs defrosting according to an outdoor ambient temperature when the air conditioner meets a defrosting condition and enters a defrosting mode; controlling a defrosting operation of the air conditioner according to the target discharge temperature of the compressor and the initial opening degree of the throttle device; and controlling the air conditioner to exit the defrosting mode when a temperature of an outdoor heat exchanger of the air conditioner reaches a set temperature value; characterised in that the controlling of the defrosting operation of the air conditioner according to the target discharge temperature of the compressor and the initial opening degree of the throttle device comprises: controlling the throttle device of the air conditioner to open to the initial opening degree; controlling the throttle device to increase an opening degree of the throttle device by a first preset opening degree at intervals of a second preset time after a first preset time elapses; and adjusting the opening degree of the throttle device according to a discharge temperature of the compressor and the target discharge temperature after the opening degree of the throttle device is increased to a sum of the initial opening degree and a second preset opening degree. controlling the throttle device of the air conditioner to open to the initial opening degree; controlling the throttle device to increase an opening degree of the throttle device by a first preset opening degree at intervals of a second preset time after a first preset time elapses; and adjusting the opening degree of the throttle device according to a discharge temperature of the compressor and the target discharge temperature after the opening degree of the throttle device is increased to a sum of the initial opening degree and a second preset opening degree.