Reinforcing and transforming structure of existing building floor slab and hoisting construction system of reinforcing and transforming structure

The reinforcing and transforming structure comprises a vertical structural part, a concrete floor slab, a floor slab reinforcing steel beam and a rooting connecting steel plate, vertical lifting and hoisting holes are formed in the concrete floor slab, and lifting and constructing devices are arranged on the upper side of the concrete floor slab and directly face the vertical lifting and hoisting holes respectively. Lifting lug plates are fixedly connected to the positions, corresponding to the vertical lifting lifting holes, of the floor reinforcing steel beams, the bottom ends of the lifting construction devices are hung on the lifting lug plates, the upper side surfaces of the floor reinforcing steel beams are tightly attached to the lower side surfaces of the concrete floors, and the end faces of the floor reinforcing steel beams are connected with the surfaces of the rooting connecting steel plates on the corresponding sides. The problem of steel beam installation and reinforcement construction caused by