Auxiliary device for measuring prism

The utility model discloses an auxiliary device for measuring a prism, which comprises a scale fixing slide bar and a scale universal slide bar, the scale fixing slide bar is connected onto the scale universal slide bar in a sliding manner, a prism base is connected onto the scale fixing slide bar in a sliding manner, and a small prism connecting screw and a laser plummet are fixed on the prism base. An equipment mounting hole is formed in the scale universal sliding rod; during use, when the difference between the position of the prism and the position of a to-be-positioned point is within a certain range, the auxiliary device for quickly lofting the prism is mounted, so that the erected prism does not need to be moved, and only the position of the small prism on the auxiliary device needs to be changed for measurement; and when the measured coordinate value of the small prism is completely consistent with the coordinate value of the to-be-determined point, the position of the small prism is projected to the