The invention discloses a lens protection device which comprises a camera, a lens, a shell, a water tank, a mini-vacuum pump, an air suction pipe, a first connecting pipe, a drying sleeve, an air return pipe, an electric push rod, a rotating disk, a wiping cotton block, a micro-motor, a sleeve, a pushing rod, a liquid injection pipe, a second connecting pipe, a flat plate, a rotating shaft, a cavity and a through hole. The lens protection device is reasonable in structure and novel in design, the air in a lens can be effectively extracted by the aid of the vacuum pump and the air suction pipe,dust is filtered through water in the water tank, the air is dried and then reflows into the lens, aggregation of the dust in the lens can be effectively avoided, so that cleaning frequency of the lens can be reduced, the service life of the lens is prolonged, the lens is protected, outer lens surface of the lens can be automatically and rapidly cleaned through the wiping cotton block and the micro-motor, the device is convenient to use, cleaning time of the lens can be shortened, and the labor intensity of a user is reduced.