High performance hot air diffusion device using uniformly distributed hot air, keep the plastic dry and uniform temperature, increase drying efficiency. Design of special hot air bent pipe, to avoid accumulation of power particles in the bottom of the electric heating pipe to cause combustion. The barrel and the inner parts are all made of stainless steel. Separation between the barrel and the bottom, material cleaning convenience, refueling quickly. Proportional deviation indicating controller, can precise temperature control. Double overheating protection device, can reduction of accidents caused by human or mechanical failure. Microcomputer control, full figure PD, control LED status display. 24 hour timer automatically boot. Inclined easy detachable magnet base.