The invention discloses a stirring device for geotechnical engineering, and belongs to the technical field of engineering machinery. The stirring device comprises a device main body, a fixing platform, a clamping door, a movable platform, a hollow rotating shaft, a conical drill bit, drill rods, rotary blades, sharp drill bits, a rocking rotating shaft, a steel wire rope, a fixed pulley, a metal buckle, a slurry passing pipeline and cement slurry equipment. The slurry passing pipeline and the hollow rotating shaft are combined into a whole through the movable platform, it is ensured that a power system is always located above the ground in the working process of the stirring device for geotechnical engineering, working safety of a motor is ensured, and the service life of the motor can beprolonged; by means of the arrangement of the rocking rotating shaft, the steel wire rope, the fixed pulley and the metal buckle, matching between the fixing platform and the clamping door can be achieved, reasonable splicing of the length of the hollow rotating shaft is achieved according to the pile length, the problem that cement slurry is wasted since a pipeline is too long is avoided, a hollow pipe column can be detached into short sections when cleaning is needed, great convenience is brought to washing work, and the workload of construction staff is reduced.