Plate shearing device of decoiler machine

The utility model relates to the technical field of metal plate processing, and provides a decoiler machine plate shearing device which comprises a supporting frame, a clamping input roller and a fixing box, a supporting shaft rod is rotatably connected to the middle of the inner side of the supporting frame, a shearing blade is slidably connected to the outer side of the supporting shaft rod, and the clamping input roller is arranged on the supporting shaft rod. According to the metal plate shearing device, a metal plate can be conveyed to the right side through rotation of the arranged clamping input roller, and the metal plate can be sheared through the arranged shearing blade when passing through the supporting shaft rod; meanwhile, the sheared metal plate can be prevented from deviating under the action of a side edge sliding roller and a limiting convex strip, and a threaded shaft can drive a transmission plate to move front and back through rotation of a first motor, so that a shearing blade and the si