The invention belongs to the technical field of building construction foundation drilling tool application and particularly discloses a large-torque rotary jetting stirring pile construction device. The large-torque rotary jetting stirring pile construction device comprises an automatic walking type trolley, a power electricity distribution operation chamber, a three-door-head sliding wheel, a main winch, a derrick, a rack supporting rod, a horizontal head sliding piece arranged on the derrick, a power transmission box body connected with the horizontal head sliding piece, a drill pipe connected with the power transmission box body, a faucet guniting structure arranged on the drill pipe, an inner pipe arranged in the drill pipe, rotary knife rows evenly arranged on the drill pipe, an alloy drill bit arranged on the end portion of the drill pipe, and a control assembly arranged in the power electricity distribution operation chamber, wherein the power electricity distribution operation chamber, the three-door-head sliding wheel, the main winch and the derrick are arranged on the automatic walking type trolley; and the two ends of the rack supporting frame are both connected with the derrick. The large-torque rotary jetting stirring pile construction device is wide in pile distribution interval, high in work efficiency, easy to operate, mature in process and wide in application range; and meanwhile, raw materials are saved, the production cost is reduced, and the purpose of remote intelligent construction operation can be achieved through the control assembly.