Fixture with positioning function for precision machining

The invention discloses a clamp with a positioning function for precision machining, which comprises a base, the left side of the top of the base is in bolting connection with a fixed seat, the right side of the top of the base is in bolting connection with a supporting seat, and the opposite sides of the supporting seat and the fixed seat are both provided with movable seats. According to the precise workpiece clamping and limiting device, a cylindrical precise workpiece can be clamped and limited, movement of a movable base can be adjusted through cooperation of a lead screw and a threaded sleeve, a user can conveniently position the precise workpiece through a clamping base, the precise workpiece is prevented from deviating, the user does not need to manually fix the precise workpiece, and the positioning effect of the clamp is improved; and meanwhile, the requirement that the clamp can position a plurality of precise workpieces is met, the working efficiency of the clamp is improved, through cooperation o