The invention discloses a dust remover capable of automatically adjusting a filtering area, the dust remover comprises a supporting assembly and an adjusting mechanism, the top end of a supporting pad is provided with a shell assembly, one side of the shell assembly is provided with an air inlet assembly assembled by a bolt, and the inner side of the shell assembly is provided with a dust removing mechanism in a penetrating manner. According to the device, a one-way circulation air conveying structure is mainly utilized and matched with a lead screw structure driven by a motor, so that a piston block can be adjusted to the position of a non-woven fabric bag which specifically needs to be inflated according to the specific requirements of equipment, the non-woven fabric bag is expanded through inflation, the cross sectional area of an equipment channel is reduced, and the inflation efficiency is improved. According to the invention, the function of automatically adjusting the filtering area according to the air crystallization degree of the plant is achieved, and the function that the equipment can adapt to the plant under different air qualities is ensured, so that the adaptation degree of the equipment is improved, manual intervention is reduced, resource waste is avoided, the equipment is prevented from being used excessively, and the service life of the equipment can be prolonged.