The utility model discloses a steel tower column with a positioning structure and relates to the technical field of bridge installation. An upper installing plate is arranged at the position, close to a top opening, of a square steel pipe and perpendicularly provided with four guiding columns, and each guiding column is arranged at one corner of the square steel pipe and stretches out of the top opening; after two steel tower columns are spliced into a whole in an up-and-down mode, a lower guiding plate of the upper square steel pipe and an upper guiding plate of the lower square steel pipe are correspondingly spliced into a rectangular plate. The overall hoisting and alignment precision of the steel tower column is improved, the construction period is shortened and labor service and mechanical equipment investment is reduced.