The invention provides an air-conditioner. The air-conditioner comprises a compressor, a first heat exchanger, an air supplying super-cooling device, a second heat exchanger and an air liquid separator which are communicated, wherein the compressor comprises a pump structure; the pump structure comprises a plurality of cylinders; at least one of the cylinders comprises a main working chamber; at least one of the cylinders comprises an auxiliary working chamber; the main working chamber and the auxiliary working chamber both are equipped with suction ports and exhaust ports; and the suction port of the auxiliary working chamber is selectively communicated with the air liquid separator or the air supplying super-cooling device. The suction port of the auxiliary working chamber is arranged as a selective communication mode, so that the pipeline of the air-conditioner can select the mode of connecting with the suction port of the auxiliary working chamber according to the practical running condition, and the heating volume and COP of the air-conditioner can be effectively promoted.