Concrete reinforcement waterproof structure after metro communication port transformation

The utility model discloses a concrete reinforcement waterproof structure after metro communication port transformation. The concrete reinforcement waterproof structure comprises an original structure top plate and an original structure bottom plate. A newly-built top plate structure and a newly-built bottom plate structure are arranged on the same sides of the original structure top plate and the original structure bottom plate correspondingly; an upper grouting pipe is arranged on the newly-built top plate beam, chiseling is conducted on a first new and old concrete combination part at the connecting position of the newly-built top plate beam, the original structure top plate and the newly-built top plate structure, then waterproof paint is coated, and first water swelling sealant is arranged on the waterproof paint; an L-shaped lower grouting pipe is arranged on the newly-built bottom plate beam, a second new and old concrete joint part of the newly-built bottom plate beam and the joint of the original str