Coupling positioning ball hole turning tool

The utility model relates to a coupler positioning ball hole turning tool which comprises a vertically-distributed cylindrical base, two oppositely-arranged first notches are vertically formed in the top face of the base, the bottom faces of the first notches are horizontal planes, and a horizontally-distributed mandrel structure is arranged between the two first notches. The bottom face and the top face of the core shaft structure are planes parallel to the bottom face of the first notch, the bottom face and the top face of the core shaft structure are connected through outwards-protruding arc-shaped faces, and the four corners of the core shaft structure are connected with the bottom face of the first notch through vertically-distributed positioning bolts. The mandrel structure comprises a first fixing shaft, a positioning shaft, a threaded shaft and a second fixing shaft which are coaxially arranged and sequentially connected, the shaft diameter of the first fixing shaft, the shaft diameter of the position