The invention discloses a waste heat recovery device, which comprises a heat-insulating outer shell, a heat-conducting water tank, heat-conducting copper pipes and a control device, wherein the heat-conducting water tank is located in the heat-insulating outer shell; the heat-conducting copper pipes are located between the heat-conducting water tank and the heat-insulating shell; the heat-conducting copper pipes are spirally wound on the outer surface of the heat-conducting water tank; the heat-conducting water tank and the heat-insulating shell are both fixedly connected with the heat-conducting copper pipes; the heat-conducting water tank is suspended in the heat-insulating outer shell through the heat-conducting copper pipes; a flow channel is formed between the heat-conducting water tank, the heat-conducting copper pipes and the heat-insulating outer shell; exhaust holes are formed on the heat-conducting copper pipes; the exhaust holes are connected with the flow channel; the flowchannel is arranged in a spiral shape; subuliform diversion pipes are arranged on the heat-conducting water tank; the subuliform diversion pipes are connected with heat exchange pipes; one end of eachthe heat exchange pipe penetrates through the heat-conducting water tank and is arranged through the heat-insulating outer shell; and the subuliform diversion pipes and the heat exchange pipes are integrally arranged with the heat-conducting water tank. The waste heat recovery device has high heat exchange efficiency.