The gypsum tumble dryer is mainly composed of hot blast stove, belt feeder, tumble dryer, belt feeder, induced draft fan, cyclone dust collector, bag filter (or wet dust collector) and operation control system. The equipment adopts the fair current (or countercurrent) drying process. The working principle as following: After entering the drying drum, the wet materials are spitting into the following working areas: First, the material guiding zone. Plaster enters this zone and contacts with high-temperature hot air to quickly evaporate moisture. The material is in a large lifting flight angle is transferred to the next working area under the splicing; Second, the copy board area, in which the gypsum is dropped and pick up by the lifting flight to form the material curtain state. At this time, the material in full contact with the hot air, and the moisture in the plaster is rapid.