The invention provides a detection method for perpendicularity of a pier stand column.The method comprises the following steps that any position where a pier can be seen is selected as an observation station point; the average angle gamma 1 of the included angles alpha 1 and beta 1 formed between the horizontal line and observation lines from the observation point to the two side edges of the pier, the point of intersection of the edge of the angle and the outer wall of the pier is the point A, and coordinate values of the point A are measured; a point B is determined on the outer wall of the pier in the same way, and coordinate values of the point B are measured; according to the radius of the cross section of the pier, the circle center O1 and the circle center O2 of the cross sections where the point A and the point B are located are determined; a vertical line is formed from the point O1 to the central axis of a bridge deck, the vertical point of the point O2 on the vertical line is M1, and the perpendicularity of the first pier is obtained through calculation according to the distance between the O1/O2 and M1 and the perpendicular height difference between the point A and the point B.According to the method, a high-precision total station is adopted for detecting the perpendicularity of the stand column, the space projection of the central axis of a columnar building is obtained through multiple cross sections in a non-contact mode, reliable data is provided for building inclined state evaluation, and basic data is provided for avoiding and correcting stand column inclination.