Air conditioning system and refrigerant recovery method and device for air conditioning system

The invention relates to the technical field of air conditioners, and discloses an air conditioning system which comprises a refrigerant circulation loop, a refrigerant circulation loop, a refrigerant circulation loop, a refrigerant circulation loop, a refrigerant circulation loop and a refrigerant circulation loop, and the refrigerant circulation loop comprises a compressor, a condenser, a throttling device, an evaporator and a gas-liquid separator; the ejector comprises a first inlet, a second inlet and an outlet, the first inlet is connected with the outlet end of the condenser, and the second inlet is connected with the gas-liquid separator; wherein the condenser is a heat exchanger with multiple flow paths connected in parallel, a target flow path of the condenser is connected to the refrigerant circulation loop in series, the first end of the target flow path is further connected with an air return pipeline of the compressor, and the second end of the target flow path is connected with an outlet of the