Positioning tool for flange machining

The utility model discloses a positioning tool for flange machining, which belongs to the technical field of flange machining and is technically characterized by comprising a shell, a lifting mechanism and a clamping mechanism. According to the flange machining device, when a flange is machined, the flange can be firstly placed above the positioning platform, the lead screw is driven to rotate by starting the motor, the lifting piece can move up and down through rotation of the lead screw, and due to the fact that the connecting piece is rotationally arranged in the rotating groove, the flange can be conveniently machined. Therefore, when the lifting piece moves up and down, the connecting piece can be driven to move up and down, the clamping piece can be rotated through movement of the connecting piece, the flange above the positioning platform can be clamped and positioned through rotation of the clamping piece, and at the moment, the flange can be more stably arranged above the positioning platform; and th