Drainage system of tunnel

The utility model relates to the technical field of tunnel waterproofing, in particular to a tunnel drainage system which comprises a tunnel body, and drainage mechanisms are fixedly connected to the two sides of a roadbed at the bottom of the tunnel body. The tunnel body comprises a rock layer, a water seepage layer is arranged on the inner side of the rock layer, a waterproof layer is arranged on the inner side of the water seepage layer, and a piling layer is arranged on the inner side of the waterproof layer. The drainage mechanism comprises a drainage layer, and a drainage groove is formed in the top of the drainage layer; by arranging the anti-blocking assembly, the water through holes in the cover plate can be unblocked continuously under the action of the anti-blocking assembly, the situation that the water through holes in the cover plate are blocked is reduced, and therefore the problem that due to blocking, accumulated water cannot be drained in time, and normal use of a roadbed is affected is solv