Large-span steel beam installation cantilever frame

The utility model relates to the field of roof steel beam construction, in particular to a large-span steel beam installation cantilever frame which comprises two bases arranged on a concrete beam on the opposite side of an installation hole, and the two bases are arranged corresponding to the to-be-installed position of a steel beam. The base is connected with an overhanging part, and the overhanging part extends into the mounting hole from the base; electric hoists and guide grooves are respectively mounted on the two overhanging parts, and the two electric hoists are respectively hooked at the two ends of the steel beam; the guide groove is slidably connected to the upper end of the overhanging part and vertically extends downwards to the steel beam mounting position from the top of the overhanging part, and the end of the steel beam is located in the guide groove; through high-altitude hoisting, the steel beam is lowered to a mounting point along the guide groove, stability is high when the steel beam is