In order to realize the cyclone milling of large pitch T-thread (the outer diameter of the workpiece is greater than 200mm, the pitch is greater than 16mm), ensure the product processing accuracy, improve the tool life and production efficiency, a machine clamp tool is designed for cyclone milling a large number of large pitch T-thread products. Two sets of machine clamping tools are designed for roughing and finishing respectively. The design structure of the clamping tool adopts the tool body parts that can be used many times and the blade that can be changed quickly. The left and right blades with wrong teeth are used in milling. The blade material is cemented carbide; By changing the corresponding parameters of the blade, the stress of the blade and the quality of the milling product can be improved, and the service life of the tool can be increased.