Hardware polishing limiting mechanism

The utility model relates to the field of hardware plate polishing, in particular to a hardware polishing limiting mechanism which comprises a workbench and a support, a polishing assembly is installed on one side of the workbench, a clamping air cylinder is installed at the end, away from the support, of the workbench, and a limiting push plate is installed at the movable end of the clamping air cylinder. A limiting push plate is arranged on the support, a driving assembly is fixedly installed at the upper end of the limiting push plate, a rotating assembly is connected to the end, close to the support, of the driving assembly, and a pressing assembly is arranged at the lower end of the rotating assembly. At the moment, the two sides of the hardware plate are limited and clamped between a limiting push plate and a support, when the protruding end of a cam rotates to the lower portion, the cam enables a pressing rod to descend to press the upper portion of the hardware plate for limiting, at the moment, the b