Dustproof device

The utility model discloses a dustproof device which comprises a flange plate, an oil seal, a dustproof cover and a rear bearing cover. The dust cover is pressed on the flange plate in an interference mode, a gap is reserved between the dust cover and the oil seal, the dust cover is wrapped by the rear bearing cover, and a gap is reserved between the rear bearing cover and the dust cover. And an opening slope for discharging residual water is reserved between the dust cover and the rear bearing cover. The dustproof cover is pressed on the flange plate in an interference mode, a gap between the dustproof cover and the flange plate is reduced, corrosion caused by accumulated water is prevented, meanwhile, the situations of loosening, abrasion and the like caused by front-back loosening of the dustproof cover are reduced, and the dustproof strength is improved. The rear end of the bearing cover is lengthened to surround the dustproof cover, external dust and sewage are prevented from entering, meanwhile, the ope