Optical cable fault detecting and positioning device applicable to optical cables with different diameters

The invention relates to the technical field of optical cable fault detecting and positioning equipment, in particular to an optical cable fault detecting and positioning device suitable for optical cables with different diameters, which comprises a fault detecting and positioning device shell, and a diameter adjusting device is arranged on the fault detecting and positioning device shell. The diameter adjusting device comprises two vertical plates which are symmetrical to each other and are vertically arranged, arc-shaped fixing clamping plates are arranged on the rear side faces of the vertical plates, an upper front side rectangular plate and a lower front side rectangular plate which are right opposite to each other are arranged on the front side faces of the two vertical plates, and a micro motor is arranged on the upper front side rectangular plate. A lead screw is arranged at the tail end of an output shaft of the micro motor and is in threaded connection with a rectangular connecting rod, a limiting r