Adjustment and calibration structure for optical instrument

The utility model discloses an adjustment structure of an optical instrument, comprising a first sleeve, a second sleeve and an adjustment component, wherein, a sliding rail is arranged at the circumferential surface of the first sleeve; the second sleeve is provided with a trepan boring inside which the first sleeve is arranged and the inner edge of which is provided with a sliding part which is arranged on and can slide on the sliding rail; the adjustment component comprises at least a toothed rack, a gear and an adjustment wheel set, wherein, the toothed rack is arranged on the sliding rail; the adjustment wheel set is provided with a rotating lever which is arranged at the second sleeve by a pivot; the gear is arranged on the rotating lever and meshed with the toothed rack to realize the linear movement and produce better transmission so as to then ensure a user precise and subtle adjustment in the purpose of quickly and accurately obtaining the best optical visual effect.