A heat pump system, comprising: a compressor; a condenser; a throttle valve; an evaporator; and a heating exchanger; the heat exchanger, comprising: an outer sleeve provided with two open ends; and at least one diversion unit group provided in the outer sleeve, wherein: a first tortuous flow channel is formed between the outer sleeve and the diversion unit group for a first fluid to flow from one end to the other end of the outer sleeve, the diversion unit group comprises a first hollow vane, a connecting channel, and a second hollow vane sequentially provided along an axial direction of the outer sleeve, and the first hollow vane, the connecting channel and the second hollow vane are sequentially connected to form a second tortuous flow channel for a second fluid to flow from one end to the other end of the outer sleeve; and wherein the compressor, the condenser, the throttle valve, and the evaporator are communicated with each other to form a circulation circuit, and the condenser adopts the heat exchanger. a compressor; a condenser; a throttle valve; an evaporator; and a heating exchanger; the heat exchanger, comprising: an outer sleeve provided with two open ends; and at least one diversion unit group provided in the outer sleeve, wherein: a first tortuous flow channel is formed between the outer sleeve and the diversion unit group for a first fluid to flow from one end to the other end of the outer sleeve, the diversion unit group comprises a first hollow vane, a connecting channel, and a second hollow vane sequentially provided along an axial direction of the outer sleeve, and the first hollow vane, the connecting channel and the second hollow vane are sequentially connected to form a second tortuous flow channel for a second fluid to flow from one end to the other end of the outer sleeve; and wherein the compressor, the condenser, the throttle valve, and the evaporator are communicated with each other to form a circulation circuit, and the condenser adopts the heat exchanger. an outer sleeve provided with two open ends; and at least one diversion unit group provided in the outer sleeve, wherein: a first tortuous flow channel is formed between the outer sleeve and the diversion unit group for a first fluid to flow from one end to the other end of the outer sleeve, the diversion unit group comprises a first hollow vane, a connecting channel, and a second hollow vane sequentially provided along an axial direction of the outer sleeve, and the first hollow vane, the connecting channel and the second hollow vane are sequentially connected to form a second tortuous flow channel for a second fluid to flow from one end to the other end of the outer sleeve; and wherein the compressor, the condenser, the throttle valve, and the evaporator are communicated with each other to form a circulation circuit, and the condenser adopts the heat exchanger. a first tortuous flow channel is formed between the outer sleeve and the diversion unit group for a first fluid to flow from one end to the other end of the outer sleeve, the diversion unit group comprises a first hollow vane, a connecting channel, and a second hollow vane sequentially provided along an axial direction of the outer sleeve, and the first hollow vane, the connecting channel and the second hollow vane are sequentially connected to form a second tortuous flow channel for a second fluid to flow from one end to the other end of the outer sleeve; and wherein the compressor, the condenser, the throttle valve, and the evaporator are communicated with each other to form a circulation circuit, and the condenser adopts the heat exchanger.