Grinding tool special for CNC machine tool

The grinding tool special for the CNC machine tool comprises a sleeve, a spring, an inner shaft, a chassis and a grinding piece, and the sleeve is used for being connected with the CNC machine tool; a containing cavity is formed in the sleeve, and the sleeve is provided with a limiting hole formed in the radial direction. The inner shaft extends into the containing cavity and is fixedly provided with a limiting piece, and the limiting piece is located in the limiting hole. The base plate is arranged at the bottom of the inner shaft, and the spring is arranged on the surface of the inner shaft in a sleeving mode and used for generating acting force on the inner shaft in the direction away from the container. A grinding piece is arranged at the bottom of the base plate and used for grinding a workpiece. By the adoption of the device, the device can be rapidly assembled with the CNC machine tool, the CNC machine tool is used for workpiece grinding, the function of the CNC machine tool is expanded, and the device