Positioning clamp

The utility model relates to a positioning clamp which comprises a base, a supporting table is arranged at the top end of the base in a rotating mode, supports are symmetrically arranged at the top end of the supporting table in a sliding mode, a plurality of air cylinders are symmetrically and fixedly arranged at the top ends of the supports in an array mode, and fixing bases are fixedly arranged between the output ends of the adjacent air cylinders. Vertical plates are symmetrically arranged at the top end of the fixed seat in a sliding mode, the vertical plates are symmetrically distributed on the front side and the rear side of the fixed seat, nuts are fixedly embedded in the vertical plates in a penetrating mode, adjusting lead screws are rotationally arranged in the nuts in a threaded mode, and clamping plates are rotationally connected to the ends, close to the middle position of the fixed seat, of the adjusting lead screws; sliding rods are symmetrically and fixedly arranged on the sides, close to the