The invention relates to a mechanical construction method for mounting a large-caliber reinforced concrete drainage pipe. The method comprises the following steps: (1) the construction is prepared; (2) a reference line is built; (3) mechanical equipment takes place; (4) a pipe is prepared; (5) the pipe is lifted in place; (6) the pipe is jacked into a socket; (7) the pipe section deviation is adjusted; (8) a pipe section is fixed; and (9) the mounting line form of the pipe is straight and smooth, pipe mouth gaps are uniform, and mouths are not staggered; and after the pipe installation is finished, the tightness of joints is checked section by section, and the pipe top elevation and the axial deviation accord with the requirements of construction specifications. The method has the following beneficial effects: used construction machinery is conventional equipment to conveniently organize the mechanical construction and to achieve the effects of safety and speediness; the method facilitates to organize the flow operation, and is high in construction efficiency and convenient for construction management; the method can reduce the labor number and the labor intensity; and when the quality is guaranteed, the mounting progress is largely quickened, and the working period is shortened.