Fan-shaped gear machining tool

The utility model belongs to the technical field of gear machining, and discloses a sector gear machining tool which comprises a base, a vertical supporting column is fixedly installed on the surface of the left side of the upper end of the base, a machining panel is arranged on the right side of the surface of the upper end of the base, and a first annular groove is formed in the surface of the upper end of the machining panel. A first annular groove is formed in the right side of the first connecting rod, a second annular groove is formed in the lower portion of the first annular groove, a second fixing cylinder is arranged in the right side of the first annular groove, and a first fixing cylinder is arranged in the right side of the second annular groove. A first ring groove and a second ring groove are formed in the surface of a machining panel, then fixing screws are rotated, and the distance between fixing cylinders is changed, so that sector gears of different sizes and shapes can be clamped, the clamp