Reinforcing structure of building structure and mounting method of reinforcing structure

The invention discloses a reinforcing structure of a building structure and an installation method of the reinforcing structure, and relates to the field of building engineering.The reinforcing structure comprises reinforcing steel plates wrapping the upper surface and the lower surface of a floor slab and the periphery of a reinforcing beam, and vertical split bolts connecting the upper reinforcing steel plate and the lower reinforcing steel plate are arranged on the floor slab; a plurality of transverse split bolts for connecting two opposite reinforcing steel plates are arranged on the reinforcing beam, a horizontally-arranged supporting steel plate is fixed to the bottom of the reinforcing beam, the reinforcing steel plates on the reinforcing beam are fixed to the reinforcing steel plates, a steel corbel assembly is fixed to the outer side wall of the reinforcing beam, and the lower end of the steel corbel assembly is fixed to the supporting steel plate. The two ends of the cross beam are installed on the