High-precision chamfering tool

The utility model provides a high-precision chamfering tool which comprises a tool bit and an installation section which are connected front and back, the installation section is in a hollow cylindershape, and a connecting mechanism is arranged in the middle in the installation section. The end face of the end, away from the installation section, of the tool bit is in an inwards-concave cone shape, the end, close to the tool bit, of the connecting mechanism is detachably connected with a core rod, the diameter of the core rod is smaller than the inner diameter of the installation section andthe inner diameter of the tool bit, and the connecting mechanism can allow the core rod to freely rotate in the axial direction. According to the utility model, the core rod capable of freely rotatingin the mounting section and the tool bit is arranged; the diameter of the core rod is matched with the inner diameter of a machined pipe fitting; the pipe fitting can be arranged outside the core rodin a sleeving mode, at the