The invention relates to a method for positioning multiple brackets. The method comprises the following steps that first, a broken line column is assembled; second, horizontal brackets are positioned,specifically, the distribution positions of the horizontal brackets are marked on a horizontal steel plate, the top of the broken column sleeves the horizontal steel plate, base points on the inner side of the broken column are aligned, thus the horizontal steel plate is located on the top faces of all the horizontal brackets, meanwhile, turn buckles are arranged between the horizontal steel plate and the top face of the broken column to adjust the horizontal steel plate, and the horizontal brackets start to be mounted; and third, oblique brackets are positioned, specifically, after the horizontal brackets are welded, the horizontal steel plate is detached, the oblique brackets start to be mounted, the horizontal brackets are taken as the datum during positioning of the oblique brackets,the angles of the brackets are controlled through an angle-controllable angle gauge, and the angle of the angle gauge is consistent with the angles between the oblique brackets and the horizontal brackets. The method is mainly applied to machining of a complex joint of the broken line column with the multiple brackets, by using a device, the brackets at different angles can be positioned rapidly and precisely, and the mounting precision of on-site members is guaranteed.