The invention relates to a heat transfer device utilizing the exhaust heat of diesel engine, which comprises a heat pipe exchanger, a by-pass pipe for exhausting, three-way pipes for the upstream and the downstream of the heat exchanger, valves for the inlet and the outlet of the heat exchanger, leakage-stopping valves for the inlet and the outlet of the heat exchanger, leaking valves for the inlet and the outlet of the heat exchanger, leakage-stopping three-way pipes for the inlet and the outlet of the heat exchanger, and an upstream valve and a downstream valve of the exhausting by-pass. While extracting the heat, the valves for the inlet and the outlet of the heat exchanger and the leakage-stopping valves for the inlet and the outlet of the heat exchanger will be opened simultaneously first, and then the leaking valves for the inlet and the outlet of the heat exchanger and the upstream valve and the downstream valve of the exhausting by-pass will be closed; when the heat does not need to be extracted, the process of closing or opening of the valves is just reverse. The heat transfer device has good sealing, can guarantee that no high-temperature exhaust enters the heat exchanger after the channel for the exhaust entering the heat transfer device is closed, and effectively prolongs the service life of the heat transfer device.