Measuring scale used for measuring coupling bolt of turbo generator set

The utility model discloses a measuring scale used for measuring a coupling bolt of a turbo generator set. The measuring scale used for measuring the coupling bolt of the turbo generator set comprises a scale body (1) and a measuring rod (2), and the scale body comprises a body part (11), a positioning end (12) and measuring end (13). The positioning end and the measuring end are extended to a same side of the body part from the two ends of the body part respectively, and are parallel with each other or get close to each other, and the measuring rod penetrating the measuring end and is arranged movably toward the positioning end, wherein the contour of the scale body is designed in such a way that on the basis that a measuring opening (W) between the positioning end and the measuring end can be clamped in a coupling (10) to measure, the measuring scale and an installing structure of the coupling can be prevented from generating mechanical interference, so that the positioning end can be positioned in a centra