Polishing mechanism for metal polishing production line

The invention relates to the technical field of polishing mechanisms, in particular to a polishing mechanism for a metal polishing production line, which comprises a driving machine tool main body, a cutter holder body fixedly connected to the driving machine tool main body, a polishing cutter and a water spraying piece fixed on the cutter holder body, a metal workpiece arranged on one side of the polishing cutter, and the polishing cutter contacting and polishing the continuously rotating metal workpiece. Polishing and cooling are achieved through the arc-shaped distributed water spraying openings in the multiple self-control units, after the water spraying pieces are close to the metal workpieces, all the self-control units automatically abut against the outer walls of the metal workpieces, and therefore the metal workpieces of different sizes can make contact with the water spraying pieces in a matched mode; in addition, the shorter the length of the self-control unit is, the stronger the water is sprayed,