Tunnel inner wall structure

The utility model discloses a tunnel inner wall structure, wherein a concrete base layer (1) is injected on the inner surface of the lithosphere on the tunnel inner wall. The tunnel inner wall structure is characterized in that the inner surface of the concrete base layer (1) is provided with an injection molded drain layer (2), an injection molded waterproof layer (3) and two lining layers (4) from top to bottom sequentially, wherein the drain layer (4) is a mixed layer formed by rubber particles, mineral wool fibers, VAE emulsion, and the waterproof layer (3) is a polyurea layer. In the tunnel inner wall structure, the original non-woven water guide layer is replaced by the mixed layer formed by rubber particles, mineral wool fibers and VAE emulsion, the original waterproof plate layer is replaced by the polyurea layer, and the mixed layer and the polyurea layer can be injected directly, thereby reducing construction difficulty, increasing construction efficiency and critically resolving the problem that the waterproof plate layer is easy to be damaged and welded joints are easy to leak water.