Method of producing cement segments (100) for tunnels, reinforced with composite material, and product thus obtained, consisting of the steps of: (A) preparing the unidirectional composite yarn (8), and transferring it to a nozzle (6);(B) making the primary reinforcement (1), by the sub-steps of: (B.1) arranging fixed pins (5) on a translating board (4) which moves through a moving mechanism; said fixed pins (5) forming a closed polygonal line (9) corresponding to the shape of the primary reinforcement (1); (B.2) pre-tensioning, in which the unidirectional composite yarn (8) is pretensioned around the closed polygonal line (9); (C) making the secondary reinforcement (2), by the sub-steps of:(C.1) arranging a plurality of fixed pins (5) on said board (4); (C.2) pre-tensioning;(D) assembling the primary reinforcement (1) into the housings (2.1) arranged on the secondary reinforcement (2), forming the structural cage (10) of the segment (100); (E) strengthening, in which a seam is made to stably connect the primary reinforcement (1) to the secondary reinforcement (2); (F) casting, in which the concrete is cast forming the cement segment (100) for tunnels.