The invention discloses a stage type temperature range controlling heat exchanger. The stage type temperature range controlling heat exchanger comprises a heat exchanger and a heat exchange device, wherein the heat exchanger comprises a target liquid inlet and a target liquid outlet, the target liquid outlet is a three-way valve, the third outlet of the target liquid outlet communicates with theheat exchanger, and a temperature detection device is arranged on the third outlet of the target liquid outlet; and the heat exchange device comprises a heat exchange body, a hot liquid inlet, a coldliquid inlet and a discharge outlet, the interior of the heat exchange body is a spiral channel, both the hot liquid inlet and the cold liquid inlet communicate with the periphery of the heat exchangebody, the discharge outlet communicates with one end of the heat exchange body, and a second liquid outlet of the target liquid outlet communicates with the hot liquid inlet through a pipeline. According to the stage type temperature range controlling heat exchanger, a heat exchange mode of a traditional heat exchanger and a singleness status of the heat exchange device are changed, through the combination of the heat exchanger and the heat exchange device, different heat transfer modes are comprehensively utilized, so that the heat exchange efficiency is greatly improved.