The invention relates to an oar body comprising an oar hub and a plurality of oar blades connected to the oar hub. The oar body is characterized in that wheel rims are formed at the peripheries of the oar blades; gear teeth distributed along the circumferential direction are formed on the peripheral walls of the wheel rims; and two ends of the oar hub are conical streamline forms. The oar body has the advantages that the conventional rotating shaft structure is cancelled, one wheel rim is formed outside each oar blade, so that the rotation mode of the oar blades is changed from rotating shaft rotation in a rotation torque transmission method into wheel rim rotation, the oar blades of a screw propeller are rotated by engagement of gears on the wheel rim instead of rotation of a rotating shaft, a main engine of a ship and the screw propeller can be connected without a mechanical rotating shaft, and a propelling device without the rotating shaft is provided for the ship, thus the technical problem of the rotating shaft of a large ship is solved, and a cabin of the ship can be designed more flexibly; in addition, the oar blades are driven to rotate by using a gear engagement mode, the output power of the screw propeller can be greatly reduced under the same power, and therefore, the work efficiency of the ship is improved, the energy consumption is reduced, and the purpose of saving energy is achieved.