Adjustable flange positioning tool

The utility model discloses an adjustable flange positioning tool which comprises a device body, a center fixing shaft is arranged on one side of the device body, a sliding groove is formed in the top of the center fixing shaft, a lower clamping plate is arranged on one side of the sliding groove, an upper clamping plate is arranged on one side of the lower clamping plate, and a nut is arranged on one side of the upper clamping plate. A mounting block is arranged on the back face of the lower clamping plate, a telescopic inner rod is arranged at the bottom end of the mounting block, a telescopic outer rod is arranged at the bottom end of the telescopic inner rod, a fixing sleeve is arranged at the bottom end of the telescopic outer rod, a rubber pad is arranged at the bottom end of the lower clamping plate, and a threaded rod is arranged at the axis of one side of the lower clamping plate. According to the technical scheme, the flange can be fixed to the device body through the arranged center fixing shaft, t