The invention discloses a large-diameter drilled pile construction method. The large-diameter drilled pile construction method comprises the following steps: (1) a drilling platform is built; (2) a steel protection cylinder is constructed; the top surface of the steel protection cylinder is higher than the top surface of the drilling platform by 50 cm; (3) a down-hole drill is used for construction; 28-30 small holes are drilled in the pile foundation plane range; gaps between the small holes are controlled within 35-40 cm; and the drilling depth is above the pile bottom elevation by 30 cm; (4) finished holes are constructed; (5) the holes are cleaned through reverse circulation, so that the residue thicknesses at the bottoms of the finished holes are lower than 5 cm, the mud weights in the holes are 1.03-1.1, and the sand contents are not higher than 2%; (6) a reinforcement cage is placed; and (7) concrete is poured. The large-diameter drilled pile construction method can overcome theconstruction difficulties of high-strength rock layers, improves the quality of drilled piles, and guarantees the stability of a bridge main tower.