The invention discloses an air-conditioning system. The air-conditioning system comprises a compressor, a four-way valve, an indoor heat exchanger, an outdoor heat exchanger, a control valve and a throttling control assembly. The first end of the four-way valve is connected with the second end of the four-way valve through the outdoor heat exchanger, the throttling control assembly, the indoor heat exchanger and the control valve in sequence. The third end of the four-way valve is connected with an exhaust outlet of the compressor. The fourth end of the four-way valve is connected with an air return opening of the compressor. The throttling control assembly is used for throttling a refrigerant flowing into the indoor heat exchanger from the outdoor heat exchanger, and meanwhile controlling the opening degree of a flow path between the outdoor heat exchanger and the indoor heat exchanger. The invention further provides an air-conditioner and a refrigerant recycling control method. According to the air-conditioning system, the air-conditioner and the refrigerant recycling control method, when the refrigerant is recycled, the throttling control assembly can be closed directly so as to recycle the refrigerant, the control valve is closed to achieve automatic recycling of the refrigerant when refrigerant recycling is completed, and thus the refrigerant recycling cost can be reduced.