Machine is a box structure, the car equipped with a multi-layer conveyor belt in the car circular motion. Homogeneous distribution of material on the first layer of the conveyor belt, through the chain of transmission by the first layer of mesh belt mesh belt into the next layer, the lower layer has been falling backward alternately by the last layer belt, when the water has reached the material drying requirements. Countercurrent air circulation technology, high temperature and low air flow through the dryer upward from the lowermost belt, conduct heat and mass transfer, so as to achieve the purpose of removing the water, exhaust gas discharged from the top by the induced draft fan. High degree of automation equipment, automatic stacker material in the drying process to ensure uniform drying. Low labor intensity, good working environment, equipment maintenance is simple. Bottom blanking swash plate design and quick cleaning open the door for cleaning powder box.