The invention relates to a drying machine, which is a rotary drying machine, and comprises a barrel body. A lifting blade is arranged in the peripheral direction of the inner wall of the barrel body, a central tube is arranged in the center of the barrel body, and an X-shaped lifting blade is arranged on the central tube. The invention leads the central X-shaped lifting blade to be additionally arranged in the drying machine, the material entering into the drying machine is firstly brought to a certain height through the lifting blade along the peripheral direction, then the material is cast and lifted, the material after being cast enters into the central X-shaped lifting blade, the material is cast again in the X-shaped lifting blade, thereby forming the material casting layer upon layer, because the material in the X-shaped lifting blade is unceasingly cast, the dwell time of the material in the X-shaped lifting blade is prolonged, the exchange chance of the material and the hot air is increased, thereby improving the heat exchange efficiency in the drying machine.