Osteotomy ruler for pelvic osteotomy and measuring method

The invention belongs to the technical field of pelvic osteotomy, and relates to an osteotomy ruler for pelvic osteotomy and a measuring method; the osteotomy ruler comprises a ruler, a 180-degree protractor, a 90-degree protractor and a measuring line; the ruler and the 180-degree protractor are vertically and fixedly arranged, and the 0 scale on the ruler is aligned with the 0 scale on the 180-degree protractor; a rotating shaft is connected to the 0 scale of the 180-degree protractor; the rotating shaft is perpendicular to the 180-degree protractor, and a protractor positioning rod is connected to the front portion of the rotating shaft; the rear portion of the rotating shaft penetrates through the 180-degree protractor and is provided with a locking piece used for locking the rotatingshaft to rotate; the rotating shaft is sleeved with the bottom of the 90-degree protractor; the 90-degree protractor is located between the ruler and the 180-degree protractor, and the plane where the90-degree protractor is l