Spectacle frame fixing clamp

The utility model relates to a mirror bracket fixing clamp. The mirror bracket fixing clamp comprises a U-shaped bottom plate, a first sliding rail and two clamping mechanisms, wherein the first sliding rail is fixed on the U-shaped bottom plate; the two clamping mechanisms are arranged at the two ends of the first sliding rail; the clamping mechanism comprises a first sliding block in sliding fit with the first sliding rail, a transition plate fixed to the first sliding block, a second sliding rail fixed to the transition plate, a second sliding block in sliding fit with the second sliding rail, a clamping plate fixed to the second sliding block and a clamping air cylinder fixed to a side plate of the U-shaped bottom plate. The clamping rod is connected with the output end of the clamping air cylinder, the first adjusting mechanism is used for driving the first sliding block to reciprocate in the length direction of the first sliding rail, the second adjusting mechanism is used for driving the second sliding