Aiming at the burying of deep and long pile casings during the construction of large-diameter cast-in-place piles in deep and loose fill, muddy soil and coarse sand, an efficient and safe embedding method with multi-functional drilling rig is proposed. In this process, a rotary drilling rig is used to guide the hole, and then a special adapter is used to connect the power head of the drill with the top of the long casing. The multi-functional drill uses super torque to rotate the casing with alloy cutter head at the bottom and cut the formation, and at the same time, the casing is pressed down to a predetermined depth. The technology effectively can improve the embedding efficiency of large-diameter deep and long pile casings, ensures the verticality of the pile casings, and has little impact on the surrounding strata,and it is a new technological method for the placement of large-diameter deep and long pile casings.