New and old sewage pipe network connection system based on reverse building method pipe jacking well

The utility model discloses a new and old sewage pipe network connection system based on a reverse building method pipe jacking well. The system comprises a current situation sewage pipe, a newly-built water pipe, a jet grouting pile waterproof curtain, a reverse building well protection wall, a lining well wall, a reinforced concrete gate pier, a rectangular box gate plate, a current situation pipe cutting line, backfill concrete, a bottom plate and a cushion layer. A reverse construction well protection wall is formed on the inner side of the jet grouting pile waterproof curtain through a manual earth cutting reverse construction method, a lining well wall is arranged on the inner side of the reverse construction well protection wall, and a cushion layer and a bottom plate are arranged after the bottom of a current pipe cutting line area is excavated and emptied; reinforced concrete gate piers are arranged at the downstream waste port of the current sewage pipe, clamping grooves are reserved, the rectangula