The invention provides a fuel cell and power cell heat exchange system and a control method. The fuel cell and power cell heat exchange system comprises: a first heater; a first heat exchanger communicated with a fuel cell through a pipeline; a second heater attached to the fuel cell and which is connected with a power cell or an external charge interface; a second heat exchanger and a third heater that are attached to the power cell, wherein the second heat exchanger is communicated with the fuel cell through a pipeline, and the third heat exchanger is connected with the external charge interface; a controller. The controller uses different heating devices to heat the fuel cell and the power cell according to the magnitude of a first temperature of the fuel cell, the magnitude of a second temperature of the power cell and state of charge of the automobile, waste heat of the fuel cell is utilized to heat the power cell and a passenger cabin, and resources are saved.