Tunnel reinforcing device of shield tunnel

The invention belongs to the technical field of tunnel reinforcement, and particularly relates to a shield tunnel reinforcement device which comprises a tunnel and grouting holes formed in the inner wall of the tunnel, the grouting holes are divided into a plurality of sets, each set of grouting holes are annularly distributed in the inner wall of the tunnel, and six pipe pieces are laid at the positions corresponding to the six grouting holes in the inner wall of the tunnel. Every two adjacent arc-shaped supporting steel frames can be connected through the arranged connecting plates, every two adjacent connecting plates can be connected and fixed through the arranged reinforcing rods in the tunnel direction, and therefore the connecting plates and the reinforcing rods are matched with each other to be reinforced to the multiple sets of arc-shaped supporting steel frames connected to the inner wall of the tunnel in an I-shaped mode. And a better reinforcing and supporting effect can be achieved, and meanwhile