Bending difference measuring device of leveling staff

The utility model discloses a bending difference measuring device of a leveling staff, which comprises an upper end fixed gripper, a steel wire tightener, a steel wire, a lower end fixed gripper and a depth gauge, one end of the steel wire tightener is connected with the upper end fixed gripper through a hook, and the other end of the steel wire tightener is connected with the steel wire through a hook. And the other end of the steel wire is connected with the lower end fixing gripper through a hook. Particularly, the steel wire with the diameter of 0.3 mm and the tensile strength of 2060 MPa or more is adopted to replace the coarse sewing thread with the diameter of about 1 mm, and errors caused by bending of the sewing thread can be effectively avoided; a ruler with the minimum division of 1mm is replaced by a depth gauge with the measurement precision of 0.1 mm, so that the measurement precision is improved by one order of magnitude; the operation is simple, only one person is needed, and manpower is saved