The invention discloses an equal feeding quantity type self-controlled worm polishing and dust exhausting mechanism. The equal feeding quantity type self-controlled worm polishing and dust exhausting mechanism comprises a workbench, a worm polishing device and a worm clamping device, wherein the angle defined by the inclined worm clamping device and the worm polishing device corresponds to the tooth-shaped spiral angle of a worm required to be polished; a feeding device is arranged on the workbench and on each of both sides of the worm clamping device; the worm clamping device and the feeding device are mounted on a sliding base; the sliding base is connected with a sliding base motor; a dust extracting device is mounted at the intersection of the worm polishing device and the worm clamping device. According to the equal feeding quantity type self-controlled worm polishing and dust exhausting mechanism disclosed by the invention, the feeding quantity is controlled by the sliding base motor, the feeding quantity for each time is equal to the previous feeding quantity plus the polishing consumption quantity, so as to meet feeding conformance for each time; the polishing position of the armature spindle worm is automatically regulated, so as to reduce the abnormal noise caused when a water wiper motor works; the technological method improves the machining precision of the armature spindle worm to a large extent.