The invention discloses a plate drying room and provides a drying device which is high in heat utilization rate, fast in drying speed, stable in quality and high in air dryness and cleanness, and used for improving the quality of a paint drying process. The plate drying room is characterized by comprising a drying room with a transmission belt; an inlet and an outlet are formed in side walls, opposite to two ends of the transmission belt, of the drying room; a storage bracket and a delivery bracket are respectively arranged on the outer sides of the inlet and the outlet; a plurality of heating plates are distributed on support legs of the transmission belt or walls of the drying room; the heating plates and a temperature sensor are connected with an electric control box; a plurality of fans are mounted in the drying room, and are connected with the electrical control box; a plurality of rectangular observation windows are distributed on the wall on one side, in the length direction, of the drying room; and a dehumidifier with an automatic dehumidifying function is arranged in the drying room. As the heating plates are distributed in the heating room, the dryness and the temperature of the drying room can be kept constant; and as the fans are mounted in the drying room, hot air can diffuse uniformly.