The invention discloses an installation method for bidirectional tilting great-section box latticed columns. By taking a structure as a reliably laced fixed attachment structure, two side tilting latticed columns are connected and fixed by using a latticed bracket in the structure, so that a stable triangular structure system is formed. By means of a computer simulation technology, the method disclosed by the invention solves the problem that bidirectional tilting great-section box latticed columns are difficult to install and position and the installation quality is not easy to guarantee. The method disclosed by the invention is strong in operability and high in safety, ensures the installation quality of bidirectional tilting great-section box latticed columns, enhances the installation efficiency of bidirectional tilting great-section box latticed columns, effectively shortens the construction period and saves the cost, and therefore, the method has good economic and social benefits.