Sewer protection structure of building wall corner

The utility model discloses a sewer protection structure of a building wall corner, which comprises a floor, a ceiling, a side wall I and a side wall II, and is characterized in that the side wall I and the side wall II are provided with a groove body I and a groove body II, the floor and the ceiling are provided with an upper sliding groove I and a lower sliding groove I, and the floor and the ceiling are also provided with an upper sliding groove II and a lower sliding groove II. A plurality of rollers are arranged in the first lower sliding groove and the second lower sliding groove respectively. A first protection plate is movably sleeved with the first upper sliding groove, the first lower sliding groove and the first groove body, a second protection plate is movably sleeved with the second upper sliding groove, the second lower sliding groove and the second groove body, and a right-angle wrap angle strip is arranged on the external corner face of the connecting position of the first protection plate and