With the growing prevalence and advancement of small rotary-wing unmanned aerial vehicle (UAV) in military, research, and commercial sectors, suppressing rotor noise presents both a challenge and an opportunity. This issue is a current hot topic in UAV development. To address this, this article draws inspiration from the serrated structures found on owl feathers and explores the application of trailing edge serrations on rotor blades. The study investigates how these serrations affect the aerodynamic and acoustic performance of the rotor blades. The research revealed that trailing edge serrations significantly enhance the tensile performance of rotor blades at the same rotational speed. Additionally, these serrations effectively suppress sound pressure levels in the low-frequency range (frequencies below 3000 Hz). Specifically, trailing edge serrations can reduce the sound pressure level by up to 9 dB directly beneath the rotor blades, demonstrating their effectiveness in noise reduction and validating their potential for rotor blade noise suppression.