The invention discloses a one step formed tunnel assembly pipe piece, which comprises a top sealing block, an arch raising block and assembly blocks, wherein the top sealing block and the arch raisingblock are all reinforced concrete pieces or steel fiber concrete pieces; the width of the top sealing block gradually changes from front to back into a wedge shape; the arch raising block comprises an arch raising bottom block and an arch raising top block; the top sealing block, the arch raising bottom block and at least two assembly blocks are assembled into an annular structure matched with aninner cavity of a tunnel; the arch raising top block is positioned above the arch raising bottom block; the top surface of the arch raising top block is horizontal; the left and right ends of the arch raising top block are respectively spliced with the corresponding to the assembly blocks; the middle part of the arch raising top block and the middle part of the arch raising bottom block are assembled by matching concave and convex limiting slots, a pipeline passage is formed between the arch raising top block and the arch raising bottom block. The secondary pouring and filling of the structural pavement is not needed, the construction cost is reduced, the use time and the effective use space of the formed tunnel is improved, the transportation time of the pipe pieces in the constructionprocess is reduced, and the construction production efficiency is improved.