The present invention relates to the technical field of battery manufacturing, and provides an electrode plate slitting cutter (100) and an electrode plate slitting machine. The electrode plate slitting cutter (100) comprises: a frame; an upper cutter roller (20), two ends of the upper cutter roller (20) being rotatably connected to the frame; and a lower cutter roller (30), the lower cutter roller (30) being located below the upper cutter roller (20) and arranged in parallel with the upper cutter roller (20), and two ends of the lower cutter roller (30) being rotatably connected to the frame, wherein one of the upper cutter roller (20) and the lower cutter roller (30) is provided with a double-edged cutter, and the other is provided with a cutter groove (221) corresponding to a position of the double-edged cutter.