Air-adjustable internal heating type dryer capable of prolonging service life

The invention provides an air-adjustable internal heating type dryer capable of prolonging the service life. The air-adjustable internal heating type dryer capable of prolonging the service life comprises a roller shell, a feeding port is formed in one end of the roller shell, a discharging port is formed in the other end of the roller shell, a material guiding groove is formed in the feeding port, an overflowing gap is formed between the feeding port and the material guiding groove and used for introducing high-temperature flue gas, a plurality of material raising plates are arranged on the inner wall of the roller shell, an inner cylinder is arranged in the center of the interior of the roller shell, a plurality of supports are arranged between the inner cylinder and the roller shell and used for fixing the inner cylinder, the area between the inner cylinder and the roller shell is used for containing materials, a plurality of material shoveling plates are evenly distributed on the outer wall of the inner c