Ultra-light large-diameter facing cutter

The utility model provides an ultra-light large-diameter facing cutter, which is integrally elongated. Both the left side and the right side of a facing cutter are protruded outwards and are cambered, a plurality of cutter holders are respectively arranged at the left edge and the right edge of the facing cutter, and a blade is fixed onto each cutter holder. The ultra-light large-diameter facing cutter is high in machining efficiency, low in cost and light in weight, and can solve the problem that a large plane cannot be machined on a small machine tool in the prior art.