The utility model discloses a prefabricate piecemeal assembled utility tunnel entirely, piping lane have arc top, arc wall and a flat cube by what a plurality of prefabs were constituteed, the prefab includes the roof, and it is the arc structure, two curved curb plates, it sets up respectively the both sides of roof, the upper portion of curb plate with the smooth -going connection of roof, and the bottom plate, its with the smooth -going connection in lower part of curb plate, vertical piece department moment of flexure convergence between roof, curb plate and the bottom plate is in 0. The utility model discloses it is rational in infrastructure, outstanding resistance to compression shear behavior has.