Mechanical part machining clamping tool

The utility model discloses a mechanical part machining clamping tool, a clamping mechanism comprises a clamping seat and clamping plates which are symmetrically arranged, the bottom of the clamping seat is fixedly connected with the top of a bottom plate, and clamping grooves are formed in the sides, close to each other, of the outer surfaces of the two clamping plates. According to the mechanical part machining clamping tool, the rotating rod drives the rotating sleeve to rotate, the willow leaf plate rotates along with the rotating sleeve, and due to the fact that the length and the width of the willow leaf plate have a certain difference value, when the length and the width rotate and change, the two sides of the willow leaf plate make contact with the contact plate and the right side connecting strip correspondingly, and the contact plate and the right side connecting strip are far away from each other; and the contact plate drives the connecting strip on the left side to synchronously move under the act