Precise device for measuring size of shaft step

In order to solve the problem that a conventional shaft detection device is difficult to detect a shaft step, the utility model provides a precision device for measuring the size of a shaft step, which comprises a supporting device for supporting a shaft to be detected; the device further comprises a first moving mechanism and a detection device. The detection device is arranged on a movable part of the first moving mechanism; the detection device comprises a detection rod used for detecting the shaft step, and the detection rod and the supporting device are correspondingly arranged; and step part parameters of the to-be-detected shaft are acquired. 本实用新型为解决现有轴检测装置难以检测轴台阶的问题，提供一种测量轴台阶尺寸的精密装置，包括用于支撑待检测轴的支撑装置；还包括第一移动机构以及检测装置；检测装置设置于第一移动机构的可移动部件上；检测装置包括用于检测轴台阶的检测杆，检测杆与支撑装置对应设置；获取待检测轴的台阶部位参数。