Anti-seepage structure at junction of new and old buildings

The utility model discloses an anti-seepage structure at the junction of a new building and an old building, which comprises an anti-seepage structure at the junction of the new building and the old building in the vertical direction and comprises a groove body formed on an existing bottom plate and a wall body of the old building; the bentonite waterproof slurry is filled in the groove body; the end of an old waterproof layer on the existing wall body is laid on the bentonite waterproof slurry at the groove body; a newly-built bottom plate and a newly-built wall are constructed, and the newly-built wall is perpendicularly connected with the existing wall; a new waterproof layer is laid on the outer side face of the newly-built wall body, and the end of the new waterproof layer is laid on the bentonite waterproof slurry at the groove body of the existing wall body; a metal strip is arranged at the joint of the new waterproof layer and the old waterproof layer, and the metal strip presses the new waterproof la