The invention discloses a heating mechanism. The heating mechanism comprises a barrel used for heating materials, a feeding hole, a discharging hole, a helical heating tube, an air inlet and a plurality of air outlets, wherein the feeding hole and the discharging hole are formed in the barrel; the helical heating tube is arranged in the barrel and is used for introducing and exhausting hot air flow; the air inlet is formed in the barrel and communicates with one end of the heating tube; the plurality of air outlets used for exhausting the hot air flow are formed in the surface of the heating tube at equal intervals; the heating tube is embedded in an inner wall of the barrel; the air outlets are formed in a tube wall, which is exposed outside the inner wall of the barrel, of the heating tube. The heating mechanism disclosed by the invention is simple in structure, and is convenient to operate; the heating tube is of a helical structure, so that the flowing speed of the hot air flow is lowered greatly; meanwhile the heating tube is provided with the plurality of air outlets at equal intervals, so that the materials can be heated more uniformly, dead corners of heating are eliminated, a better carbonizing effect is achieved, and the efficiency is increased; the heating tube is embedded in the inner wall of the barrel, so that the materials can be prevented from being collided with the heating tube while passing, and the service life of the heating tube is prolonged greatly.