Positioning clamp for opening holes in cambered surface of optical coating umbrella

The invention relates to a positioning clamp, in particular to a positioning clamp for opening holes in the cambered surface of an optical coating umbrella. The invention aims to provide the positioning clamp for opening the hole in the cambered surface of the optical coating umbrella, which is relatively high in working efficiency. The positioning clamp comprises a supporting shell, supporting frames, a supporting assembly, a clamping assembly and the like, the supporting frames are arranged on the left side and the right side of the lower portion of the supporting shell, the supporting assembly is arranged on the upper portion of the supporting shell, and the clamping assembly is arranged on the supporting assembly. When the clamping blocks move towards the inner side, a film coating umbrella can be clamped, then people can rotate the film coating umbrella to adjust the rotation angle, and can also rotate the rocker to drive the pushing frame to move rightwards, so that the supporting plate is driven to rot