The invention provides an air-conditioning system and a heat radiation method of a compressor driving plate. The air-conditioning system comprises a compressor, a subcooler as well as a compressor driving plate, wherein the supercooler comprises a cooling tube and a supercooling tube; the cooling tube is used for supercooling the supercooling tube; the compressor driving plate is mounted at the downstream of the cooling tube through a heat exchange component. By adopting the technical scheme of the invention, through heat exchange of a flow refrigerant and the compressor driving plate, the operation performance of the air-conditioning system can be improved.