The invention relates to a reverse lifting belt refining device for a vertical feeding system of a shredder, which is particularly effective for puffing tobacco stalk materials, and belongs to the field of tobacco machinery. The reverse lifting belt refining device is characterized in that a set of reverse lifting belt refining device is arranged in the guide cabin of the vertical feeding system of the shredder; the bottom of the lifting belt refining device is arranged at a position which is above a lower row chain of the shredder and at the front feeding end of a driving roller of an upper row chain; the top of the refining device is positioned at the lower end of a front distributing plate; a lifting belt of the refining device is used for driving a driving shaft at the upper end through an external motor, and the moving direction of the lifting belt is opposite to a feeding direction; and during production running, a signal is obtained by a photoelectric detection switch when a puffed stalk material falls into the vertical feeding cabin of the shredder from a blanking hole in the front end and the material height is up to a preset height, the reverse refining belt starts running to rake out residual materials from the feeding end of the driving roller of the upper row chain away from a back push plate, and the quantity of the compressed puffed stalk material entering a row chain system is uniform, so that the material density at the cutter door position of the shredder is uniform, and the shredding quality is ensured.