The equipment structure is composed of horizontal cylinder, exhaust pipe, feed device, discharge device, screw device in the cylinder, cleaning device, paddle plate, induced draft device, transmission device, dust removal device and electric control device. Performance characteristics To solve the problem of water vapor returning to the material when the temperature of the system decreases in the same direction movement caused by the downstream dehumidification of the traditional dryer. In the drying process, the hot air flow moves forward from the tail, fully contacts with the materials, makes full use of the heat transfer through heat conduction, convection and radiation, and promotes the material movement through internal spiral mixing, sweeping, copying, to complete the whole drying process, countercurrent conduction dehumidification, and avoid reducing repeated drying procedures.