Bean dregs dryer mainly consists of the heat source(hot blast stove or gas producer furnace), material feeder(beater), rotary drying roller, discharger, induced draft fan, driving device, unloader, and power distribution cabinet. After a certain degree of dehydration and scattering, wet bean dregs enters into the drying roller through the material feeder. Under the stirring of the lifting plates and shoveling plates that distribute evenly inside the roller, the bean dregs scatter evenly and contacts with hot air sufficiently in the drying area. This speeds up the drying heat transfer and mass transfer. Wet air is pumped by air-inducing device, which avoids material from being wet again.