The utility model is applicable to the technical field of power tube buses and provides a hinge shaft type displacement device. The device comprises a drive rod, a rotating shaft, a pull rope and a dial plate with scales, wherein the pull rope is tightly wound on the rotating shaft, each of the two ends of the drive rod is provided with a strut, each strut is provided with a threaded hole, each threaded hole is provided with a matching tensioning screw, and the two ends of the pull rope are respectively and correspondingly fixed on the two tensioning screws. According to the hinge shaft type displacement device, linear displacement of a power tube bus is amplified and converted into angular displacement of the rotating shaft, and the angular displacement is indicated on the dial plate by a pointer, which facilitates intuitive and accurate observation by management personnel.