Novel reinforcing device for reinforced concrete beam and floor slab and construction method of novel reinforcing device

The novel reinforcing device comprises a cross beam and a floor slab, the floor slab is poured at the top of the cross beam, tie bars are arranged on the two sides of the bottom of the floor slab, mounting holes are formed in the two sides of the top of the floor slab, and first threaded pipes are arranged in inner cavities of the mounting holes; and a gap between the first threaded pipe and the mounting hole is filled with an adhesive, a first bolt is arranged at the bottom of the tie bar in a penetrating mode, and the first bolt is in threaded connection with an inner cavity of the first threaded pipe. Through cooperative use of the cross beam, the floor, the tie bar, the first threaded pipe, the adhesive, the first bolt, the second threaded pipe, the second bolt, the supporting plate, the round hole, the third bolt, the rubber block, the U-shaped frame, the threaded rod and the third threaded pipe, efficient and rapid reinforcing work can be achieved, materials are easy to obtain, the cost is low, and then