The invention relates to a carbonizing device which comprises a rod forming machine and a motor. The rod forming machine is provided with a screw propeller, the screw propeller is provided with a belt, the other end of the belt is hinged to the motor, the rod forming machine is provided with a directional conical sleeve, the directional conical sleeve is sleeved by an electric heating sleeve, the rod forming machine is provided with a guiding tube, a carbonizing tube is arranged in the guiding tube, the carbonizing tube is provided with a discharging tube, the discharging tube is provided with a cooling box, a water inlet is formed in the cooling box, a water outlet is formed in the cooling box, and a discharging opening is formed in the discharging tube. The carbonizing device is simple to operate, high in work efficiency and free of emission in a producing process. In addition, manufactured charcoal is high in quality and is prevented from spontaneous combustion in a high temperature without being processed.