The invention provides a chlorinated polyethylene drying device which mainly comprises an air inlet device, a feeding device, a flashing device and a two-stage drying device. A drying preheating device is arranged between the feeding device and the flashing device and provided with a spiral drying plate and a water collection chamber arranged below the spiral drying plate. A vibrating mechanism isarranged in the flashing device. Hot air type cyclone separators are arranged between the flashing device and the two-stage drying device, and an air supplement device is arranged at an inlet of eachcyclone separator. By means of the chlorinated polyethylene drying device and method, the drying degree of chlorinated polyethylene is increased, agglomeration between chlorinated polyethylene powdermaterials can be reduced easily, the particle size of the dried chlorinated polyethylene can be further reduced, and use of the chlorinated polyethylene is convenient.