Trimming device of grinding machine

The utility model discloses a trimming device of a grinding machine. Including a machine frame, a winding shaft is rotationally connected to the rack. A first driving device for driving the winding shaft to rotate is arranged on the rack; wherein the machine frame is provided with a transverse moving table moving in the length direction of the winding shaft, the transverse moving table is providedwith a longitudinal moving table moving in the length direction of the machine frame, the longitudinal moving table is provided with a cutter, the cutter is parallel to the end face of a thin film onthe winding shaft, and the height of the cutter is smaller than or equal to the lower surface of the winding shaft. The winding shaft is used for winding the thin film; following completion of winding, winding shaft rotation, at the moment, the transverse moving table moves the cutter to the circumferential end face, parallel to the winding shaft, of the film roll, then the relative position between the cutter and the win