The invention discloses a bored tunnel mechanized construction method in combination with a drilling injection method, and belongs to the technical field of tunnel engineering.Advanced reinforcement is carried out on a tunnel face with the drilling injection method, and then mechanized construction of a subway tunnel is carried out in combination with subway soft soil excavation equipment.The specific construction method includes the following steps that firstly, a left drilling part and a right drilling part are constructed at the same time, and advanced small pipes are driven into the tunnel face; 2, mechanized soil excavation is achieved through an excavation main arm, and real-time collection is carried out through a spading plate; 3, grids are erected and lifted through the excavation main arm, the top grid is fixed, and then the grids on the two sides are positioned and connected; fourthly, the operation of grid connecting bolt fastening, connecting steel bar welding, mesh sheet combining, guniting, construction, correction and the like is carried out through a manual operation platform carried on the subway soft soil excavation equipment.By means of the construction method, the construction efficiency of the bored tunnel section in subway construction can be improved, labor input can be reduced, and the construction period can be shortened.