Fuel cell air inlet and water inlet temperature control system and control method and new energy automobile

The invention discloses a fuel cell air inlet and water inlet temperature control system and method and a new energy automobile, and the control method comprises the steps: arranging a heating device at an intercooler on an air inlet channel of a fuel cell stack in advance; if the fuel cell stack is in the cold start stage, cooling liquid discharged from a cooling liquid stack outlet of the fuel cell stack is controlled not to pass through a radiator, and the cooling liquid is pumped into a cooling liquid stack inlet of the fuel cell stack after being heated by the heating device; otherwise, the heating device is controlled to stop working, and the cooling liquid discharged from the cooling liquid stack outlet of the fuel cell stack is controlled to pass through the radiator firstly and then is pumped to the cooling liquid stack inlet of the fuel cell stack and the cooling liquid stack outlet of the fuel cell stack at the same time. The low-temperature cold start time of the system is shortened, and the cold