New steel structure column foundation structure on existing structure

The utility model discloses a newly added steel structure column foundation structure on an existing structure, which comprises an original basement top plate, a main beam and a secondary beam which are arranged in a crossed manner are poured at the bottom of the original basement top plate, and a column is poured below the crossed point of the main beam and the secondary beam; the post-cast independent abutment is cast on the top plate of the original basement and is arranged at the intersection of the main beams, the secondary beams and the columns, and pre-embedded anchor screws are embedded in the post-cast independent abutment; the back-to-top steel beam comprises a steel beam body and end plates, a pressure-bearing flange attached to an original basement top plate is formed on the upper portion of the steel beam body, the end plates are connected to the two ends of the steel beam body respectively, the end plates are connected to the two adjacent main beams through anchor bolts, and stiffening rib plate