The invention discloses a novel rudder system for a river-ocean combined transportation ship. The novel rudder system comprises a rudder connecting shaft, upper bumps, motors, a groove, a connecting rod, lead screws, a rudder blade, a flange bearing, a lower bump, a flywheel, a wheel carrier, a folding hood, a bracket, a rotating plate, an ultrasonic transducer, a rotating bearing, a rotating shaft, a scraper blade, a hairbrush strip and a nut, wherein the rudder blade is arranged on the rudder connecting shaft; the upper bumps are arranged on the front and back side surfaces of the upper end of the rudder blade; motors are arranged at the left sides and the right sides of the upper bumps; the motors are connected with the lead screws through couplings; a groove is formed in each upper bump; and the lower end of each lead screw extends out of the corresponding groove. The novel rudder system has the advantage that the novel rudder system has a shellfish scraping function.