The utility model relates to a big shaped steel constructs post positioner and location method. Big shaped steel constructs post positioner includes that the steel constructs post expansion end and locator, and the locator is whole big shaped steel constructs post positioner's supporting platform and accurate positioning ware. It is whole positioner's guiding device that the steel constructs the post expansion end, extends the steel and constructs post to ground to the accurate location of locator. The utility model discloses an using and having reduced resource input, the use of expansion end can effectual messenger be located the accurate location of below ground steel structure post, and does not need the steel to construct post processing to ground. The utility model discloses an use and promoted construction quality, guarantee the structure security, improved the efficiency of construction for the construction progress, practice thrift a large amount of time limits for a project, very big saving resource input, reduce construction cost.