The invention provides a low-noise unmanned aerial vehicle rotor wing/propeller which comprises blades. The front edge of each blade is of a sine-wave-shaped joint structure. The tail edge of each blade is of an isosceles triangle serrated structure. Microarray membrane structures are bonded to the suction faces of wing tips of the blades. Each microarray membrane structure is composed of a basic sheet and multiple flexible columns evenly distributed on the basic sheet. By the adoption of the low-noise unmanned aerial vehicle rotor wing/propeller, the blade design structure which is feasible, economical and environment-friendly is provided, the noise of the unmanned aerial vehicle rotor wing/propeller is lowered to a certain degree, the special requirements for the unmanned aerial vehicle noise level on different occasions can be met, the efficiency of an unmanned aerial vehicle is improved, the running capacity of the unmanned aerial vehicle is enhanced, and the low-noise unmanned aerial vehicle rotor wing/propeller can save more energy, is more environment-friendly and has the economic significance.