Steel embracing beam supporting system of formwork supporting frame and construction method of steel embracing beam supporting system

The invention discloses a steel holding beam supporting system of a formwork supporting frame and a construction method of the steel holding beam supporting system. The steel holding beam supporting system comprises a steel beam, steel holding beam supports evenly fixed to the steel beam at intervals and special-shaped limiting assemblies for limiting the steel holding beam supports to the steel beam, and the formwork supporting frame is fixed to the steel holding beam supports; the supporting transverse part is perpendicular to the extending direction of the steel beam and arranged on the upper surface of the steel beam, the supporting vertical part is fixed to the lower surface of the supporting transverse part, the side edge of the supporting vertical part abuts against the upper flange and the lower flange of the steel beam at the same time, and the supporting inclined part is obliquely connected between the supporting transverse part and the supporting vertical part. The special-shaped limiting assembly