Abstract: The installing machine of screw anchor developed by authors can install screw anchors mechanically in stead of pile driving by hand, and can work above water with a cantilever arm of 1 m. Every process, such as movement, location, pole lengthening and junction, can be finished quickly and easily. The machine can install two anchors at one time with an average time of 6-7 minutes for each anchor, thus the construction velocity and safety of closure work are improved.