Supporting-beam-free reinforcing device for steel die

A steel mold supporting-beam-free reinforcing device comprises a reinforcing mechanism and a reinforcing formwork, the reinforcing mechanism comprises U-shaped stirrups and longitudinal bars, the U-shaped stirrups are arranged along a reinforced beam at equal intervals and fixedly connected to the bottoms of original beam stirrups, and the longitudinal bars are laid on the bottom faces of the U-shaped stirrups; the reinforcing formwork is provided with a material filling opening and a groove used for containing concrete, a plurality of first bolt holes are evenly formed in the top of the side edge of the reinforcing formwork at intervals, expansion bolts are arranged in the first bolt holes, and the reinforcing formwork is arranged on the outer sides of the reinforced beam, the U-shaped stirrup and the longitudinal bars and detachably connected with the reinforced beam through the expansion bolts. Pressing edges are arranged at the two ends of the reinforcing formwork, and a plurality of second bolt holes are