The invention provides a special cutter for turning an ultra-thin gasket. The special cutter comprises a blade, wherein the blade comprises a cutting edge, a front end surface of the blade and an upper surface of the blade; the front end surface of the blade is an inclined plane; a gap is formed in one end, close to the cutting edge, of the front end surface of the blade; and a groove is formed in one end, close to the cutting edge, of the upper surface of the blade. The inclined front end surface of the cutter is adopted by the special cutter for turning the ultra-thin gasket, and when a thin gasket is cut off, the knife point on the front surface of the cutter cuts off the edge of the gasket, and the cut gasket is free of a flash or a curled edge, and is flat and uniform in thickness; the gap is formed in the front of the cutting edge and plays a centering role in the cutting process, and the influence on the cutter of cutting thrust is eliminated. The groove is formed in the upper surface of the cutter, and the angle of the knife point is further reduced, so that the knife point is relatively sharp; drainage is facilitated; and accumulation of raw material debris is eliminated.