The utility model relates to a car fog brush device, including the front truck window frame, the inside of front truck window frame is inlayed and is installed glass, installs first steering wheel on the front truck window frame of glass upper end, and standing groove welding installation is the upper end of door window frame in the front to standing groove and first steering wheel looks parallel arrangement, the lower extreme of first steering wheel has the postbrachium through bolt fixed mounting, and the second steering wheel is installed to front end an organic whole of postbrachium, and the terminal welding installation of second steering wheel has the forearm, and movable mounting has the third steering wheel on the forearm, and the terminal suit of third steering wheel has the brush. This car fog brush device through mutually supporting of first steering wheel, second steering wheel, third steering wheel realize the brush to glass from erasing, under the drive of steering wheel, forearm and postbrachium cooperation motion reach appointed position, the steering engine control brush rotate, clears away the fog of glass inside. Simple structure, convenient to use, the function is diversified, and intelligent degree is high, is favorable to promoting and using.