Hydraulically-driven self-floating flow guide pier

The invention discloses a hydraulically-driven self-floating type flow guide pier which comprises a fixed flow guide pier, a supporting hinge and a floating box. The fixed flow guide pier is arranged at an estuary where branches converge into a main stream, and the whole fixed flow guide pier is of an inverted-Y-shaped structure in an overlook mode; a plurality of buoyancy tanks with certain intervals are hinged to the water facing side faces of the two wings of the fixed flow guide pier through supporting hinges. And the buoyancy tank can rotate around the trunnion and float and sink along with the change of the water level of the branch. When the water level of the branch in the dry season is low, the buoyancy tank is horizontally arranged on the bottom face of the fixed flow guide pier or is in a semi-floating state and does not participate in flow guide basically, and the fixed flow guide pier is mainly used for flow guide so as to reduce the impact of branch catchment on ships in the main flow channel. W