Positioning fixture for lathe shaft

The utility model provides a positioning fixture for a lathe shaft, which belongs to the technical field of fixtures and comprises a connecting frame, a first connecting sleeve is fixedly connected to the upper inner wall of the connecting frame, and a connecting plate is fixedly connected to the circumferential inner wall of the first connecting sleeve; the motor is fixedly connected to the bottom end of the connecting plate; the three first gears can drive three second gears on the surface to rotate synchronously, then the three second gears can drive three lead screws to rotate, the three lead screws can drive three nuts on the surface to get close to one another, and then the three nuts can drive three L-shaped movable clamping blocks on the surface to move at the same time. And then the three L-shaped movable clamping blocks slide on the surfaces of the three limiting rods and clamp the adjacent lathe shafts, the specific moving positions of the three L-shaped movable clamping blocks are selected accordi