Waterproof reinforcing structure of existing tunnel

The utility model relates to the technical field of reinforcing structures, in particular to an existing tunnel waterproof reinforcing structure which comprises a tunnel body, a waterproof plate body is arranged in the tunnel body, a damaged opening is formed in the tunnel body, and a waterproof plate at the position of the damaged opening is a damaged waterproof plate. A new waterproof plate is adopted for replacement; the new waterproof plate is arranged in an arc shape and is matched with the waterproof plate body, a plurality of first connecting holes are formed in the top wall of the damage opening, a plurality of second connecting holes are formed in the plate surface of the new waterproof plate, the second connecting holes correspond to the first connecting holes, reinforcing steel bars are planted in the first connecting holes in a steel bar planting mode, and the reinforcing steel bars penetrate through the second connecting holes; the parts, penetrating through the second connecting holes, of the re