The invention relates to the field of packaging box processing equipment, in particular to drying equipment for packaging boxes. A microwave device of the drying equipment is installed at the leftmostend of a working table, a hot drying device is located in the middle of the working table, a heat dissipation section is located at the right end of the working table, the working table is provided with a conveyor belt, the left side of the conveyor belt is a packaging box drying inlet, and the right side of the conveyor belt is a packaging box drying outlet; a conveying belt is arranged betweenthe hot drying device and the heat dissipation section, is perpendicular to the working table and is connected with the conveyor belt for cooperative use; and an arc-control device is installed insidethe microwave device, the packaging boxes with small metal pieces can be dried in a microwave heating mode, the effect that the packaging boxes can be evenly dried is ensured, the product quality isimproved, and at the same time, electric arcs are prevented from damaging the microwave device. The reasonable layout of the microwave device and the hot drying device adapts to the drying requirements of different products, good effects of sterilization, mildew prevention and the like are achieved, and the situation that the boxes are affected with damp during sea transportation can also be avoided.