The invention belongs to the field of livestock breeding, and particularly relates to a rotary dryer for breaking up livestock manure, which includes a conveying cabin, an output cabin, a main engine, an inner air duct, a transmission line pipe, a fan motor, a discharge auger, a discharge port, a hopper, Dehydrator, conveying dragon, gas generator, cyclone unloader, induced draft fan, external air duct A, external air duct B, main shaft motor, reducer, main shaft bearing, main shaft, rotary shaft bearing, rotary shaft A, rotary shaft B , Breaking up disk A, breaking up disk B, breaking up disk C, breaking up disk D, hanger, support beam, fan head, fan, anti-twisting blade A, anti-twisting blade B, the support beam, fan machine The head and the fan are inside the inner air duct, one side of the fan is connected to the anti-twisting blade A, and the other side of the fan is connected to the anti-twisting blade B.