The invention relates to a rusted iron bar polishing device, in particular to a rusted iron rod fast polishing device for hardware. According to the technical purposes to be achieved, the rusted iron rod fast polishing device for the hardware is even in polishing, high in stability and easy to operate. In order to achieve the technical purposes, the rusted iron rod fast polishing device for the hardware is provided and comprises a bottom plate, a left side plate, a first guide rod, an air cylinder, a right side plate, a top plate, a sliding rail, a sliding block, a first rack, a first spring, a wedge-shaped block, a push rod, a first polishing block, a contact wheel, a second polishing block and the like, and the bottom plate is sequentially provided with the left plate, the first guide rod, the air cylinder and the right side plate from left to right. The rusted iron rod fast polishing device for the hardware is provided, an iron rod is made to rotate through a second gear and a second rack, the effect of even polishing is achieved, and an oblique plate is utilized.