Reinforcing and underpinning device for supporting beam and pulling column

The reinforcing and underpinning device comprises a plurality of supporting columns, two residual columns are arranged between every two adjacent supporting columns at intervals, cross beams are arranged between the two residual columns and between the residual columns and the adjacent supporting columns, and the cross beams and the residual columns between every two adjacent supporting columns form a set of parts to be reinforced. The side portion and the bottom of each to-be-reinforced part are wrapped with the same bracket, a plurality of chemical bolts are arranged at the bottom of each to-be-reinforced part, a plurality of mounting through holes are formed in the side portion of each to-be-reinforced part, the longitudinal section of each bracket is in a U shape, a foamed aluminum plate is arranged on the outer wall of each bracket, and a PU foaming plate and a rubber damping cushion plate are arranged on the inner wall of each bracket. The horizontal part of the bracket is connected with the chemical bo