The invention relates to the technical field of processing of an electric wire, and discloses a metal braid cutter device and system of an electric wire. The cutter device comprises a front cutter and a rear cutter, wherein the rear cutter is provided with a round cutter hole, the front cutter comprises a front upper cutter and a front lower cutter which move relative to each other, wire grooves are respectively formed in corresponding positions of the front upper cutter and the front lower cutter and are used for fixing the electric wire, the axis when the front lower cutter and the front upper cutter are matched and the axis of the rear cutter are arranged on the same straight line, a front cutter end surface formed when the front lower cutter and the front upper cutter are matched is in clearance fit with the cutter hole, and during cutting braid, a round end surface after the front lower cutter and the front upper cutter are matched moves to enter the cutter hole. During application, the electric wire is clamped and fixed by the front upper cutter and the front lower cutter, the rear cutter is enabled to move towards a front cutter direction, and the metal braid can be cut by cutting and extruding of the end surface of the cutter hole and the end surface of the front cutter. Since the front cutter and the rear cutter are arranged concentrically, the braid is enabled to be completely cut, and the service lifetime of the cutter is prolonged.