The invention discloses a steel tower self elevating installation method, wherein a rotating hinge is arranged on the bottom portion of a steel tower main body, an auxiliary leg is hinged on the steel tower main body, after the steel tower main body and the auxiliary leg are welded on an assembling support on site, a tension system is arranged between a base of the steel tower and the bottom portion of the auxiliary leg, the steel tower is achieved to vertically rotate and lift to a scheduled position through tensioning the tension system, and then a fixed structure on the rotating hinge which is arranged on the bottom portion of the steel tower is arranged. The steel tower self elevating installation method has the advantages that: 1, the rotating hinge is arranged between the steel tower and the auxiliary leg and the steel tower and the base, the auxiliary leg of a herringbone steel tower is capable of directly using an inclined leg of the steel tower, thereby the steel tower and the auxiliary leg are convenient to be welded near the ground by lifting equipment on the ground, and the welding quality is easy to be guaranteed. 2, A prestressing tendon is arranged between the base of steel tower and the bottom portion of the auxiliary leg and supplies power for the vertical rotating of the steel tower through the tension of a jack, the steel tower lifts to the scheduled position by itself, the facilities are simple, the operation height is low, and the operation is convenient.