Gas-compression automobile side-window water wiper

The invention discloses a gas compression type car side windows wiper, which is mounted on car side window glass and composed of a slide bar, a brush, a slide bar connector, a sleeve barrel, a piston head, an expansion pipe base cover, an air passage and an air compressor, wherein the air compressor blows in air into or sucks air from an elastic sealed expansion pipe by the air passage, drives the piston head to move, and the piston head movement drives the slide bar and the glass brush to move, thereby passengers can wipe off raindrops and filth on glass surfaces in much convenience.