The invention relates to a dryer device comprising a dryer and a spray device which sprays on the surface of the dryer to form a coating; the dryer is used for drying a wet sheet; the coating is formed on the surface of the dryer; the spray device comprises a plurality of spray nozzles which are used for spraying the surface of the dryer; and the spray device can selectively adjust the spray flow of all the spray nozzles, so that the spraying amount on thin areas of the coating on the surface of the dryer is larger than that of the thicker areas of the coating on the surface of the dryer. According to the dryer device, the spray device is arranged beside the dryer and sprays on the surface of the dryer to form the coating, the thickness of the coating on the surface of the whole dryer is more uniform.