The invention discloses a dust protection device, which comprises a main body of an electric drill, a drill adjusting ring is connected to the electric drill main body, a drill clip is connected to the drill adjusting ring, and the electric drill main body is provided with a The dust protection device for internal dust, this dust protection device, through the cooperation of the outer shell, the first inner shell, the second inner shell and the spring, realizes the contraction function, and can be compressed with the drilling of the drill bit, and the drill bit will bring the dust into the In the casing, it prevents outward diffusion and plays a protective role. The collection ring can realize the rotation under the action of the linkage drive device, even if the drill bit is in different states, it can collect dust, so as to continuously collect dust into the collection chamber .