The utility model relates to the technical field of heat pumps. The technical problem that in the prior art, impurities are prone to being accumulated in a heat pump system shell pass pipeline is mainly solved. The utility model provides a heat pump system which comprises a compressor, a condenser, an evaporator and a throttling device, ribs are arranged on the outer pipe walls of heat exchange pipes in the condenser and the evaporator, and the shell side of the condenser and the pipe side of the evaporator are communicated through the compressor and the throttling device. Or the tube pass ofthe condenser is communicated with the shell pass of the evaporator through the compressor and the throttling device. The embodiment of the utility model discloses a heat pump system. the communication mode of the tube pass and the shell pass in the evaporator and the condenser is adjusted; The medium with impurities can pass through the tube pass in the evaporator or the condenser, so that accumulation of the impurities in the shell pass can be effectively improved, the technical problem that the heat exchange pipeline needs to be cleaned regularly is greatly solved, the service life of the heat exchange pipeline is prolonged, and the reliability of the heat exchange pipeline is improved.