Multipurpose gun drill grinding precision clamp holder

The utility model relates to a multipurpose gun drill grinding precision holder which comprises a clamping sleeve, a circular clamping seat is arranged in the clamping sleeve, a clamping block is arranged in the circular clamping seat, a long bolt in threaded connection with the clamping block is arranged at the upper end of the clamping block, and a limiting sliding block movably connected with the circular clamping seat is arranged on the long bolt. A limiting groove matched with the limiting sliding block is formed in the upper end of the circular clamping base, the clamping block comprises a V-shaped part and a groove part, and an included angle is formed between the V-shaped part and the groove part. The clamping device has the advantages that the round clamping base, the clamping block, the long bolt, the limiting sliding block and the limiting groove are used in a matched mode, the long bolt slides in the limiting groove and then the clamping part of the clamping block is switched, the clamping device