Building component rust removal mechanism

The invention provides a building component rust removal mechanism which is used for solving the problem that time and labor are wasted during building component rust removal. The derusting mechanism comprises a support, a polishing device is fixedly arranged on the support and comprises a cylinder, a plurality of through holes are evenly distributed in the circumferential direction of the cylinder, a rotating shaft cylinder is fixedly connected to the through holes in the inner side of the cylinder, and the rotating shaft cylinder is rotationally connected with a plurality of bevel gears meshed with one another. The bevel gear comprises a driving gear driven by a motor and a plurality of driven gears, the driven gears are fixedly connected with a sleeve, the sleeve is connected with a three-jaw chuck in a clamped mode, and a grinding disc is clamped by the three-jaw chuck. Through mutual meshing rotation of the bevel gears, efficient rotation is achieved. And the polishing disc can be stably fixed on the pol