The invention discloses a novel rotor aerodynamic structure for an unmanned aerial vehicle. The novel rotor aerodynamic structure comprises a rotor shaft and blades connected with the rotor shaft. The front edge of each blade is in a sine wave structure, the tail edge of each blade is in an isosceles right triangle shaped sawtooth structure, and the tail end of each blade is provided with a winglet which is perpendicularly mounted at the tail end of the corresponding blade. By the winglets mounted at tips of the blades respectively, streaming around of air on upper and lower surfaces can be inhibited, induced drag caused by wingtip vortexes is reduced, lift force damages caused by streaming around are reduced, lift-drag ratio is increased, and accordingly lift force is increased; in addition, due to adoption of the sine wave structured front edges and the sawtoothed rear edges according to a bionic design, low air resistance and low noise are realized. The novel rotor aerodynamic structure for the unmanned aerial vehicle has advantages of high lift force of the blades, high cruising power and low air resistance and noise in operation.