Method and device for automatically cooling of drying machine

The embodiment of the invention provides a method and device for automatically cooling of a drying machine. The method comprises the steps that judgment is conducted on whether the cooling condition is met or not according to the position of a gypsum board tail in the drying machine, when the cooling condition is met, a heat source valve is closed automatically, a waste gas damper is opened, opening of the waste gas damper is regulated according to a set cooling curve, and draught fans are closed in sequence according to the temperature, so that the cooling speed is controlled, when the temperature is reduced to be the set temperature, the operation of all the draught fans is stopped. According to the technical scheme, the method and device for automatically cooling of the drying machine have the advantages that the cooing speed of the drying machine can be controlled, equipment is protected, and the energy-saving effect can be achieved.