This paper investigates the noise reduction performance of biomimetic hydrofoils with wavy leading edges and the corresponding mechanisms. Large Eddy Simulation (LES) and permeable Ffowcs Williams-Hawkins (PFW-H) methods are used to predict cavitation noise around baseline and biomimetic hydrofoils. Results show that the wavy leading edge effectively reduces high-frequency noise but has little effect on low-frequency noise. The main source of low-frequency noise is cavity volume acceleration, while the wavy leading edge has little effect on it. High-frequency noise sources, related to surface pressure fluctuations and turbulence characteristics, are significantly suppressed by the wavy leading edge, thus decreasing high-frequency noise intensity. The wavy leading edge is found to be a promising technique for cavitation noise reduction. The study compares the noise characteristics of baseline and biomimetic hydrofoils. The wavy leading edge reduces high-frequency noise by suppressing surface pressure fluctuations and improving turbulence characteristics. However, it has little effect on low-frequency noise dominated by pseudo-thickness noise. The wavy leading edge limits cavity development to the trough region, playing a compartmentalization role. It does not suppress cloud cavitation but prevents its spread along the span. The wavy leading edge also reduces pseudo-loading noise by decreasing pressure fluctuations and modifying wake turbulence. The study concludes that the wavy leading edge primarily reduces high-frequency noise through these mechanisms.This paper investigates the noise reduction performance of biomimetic hydrofoils with wavy leading edges and the corresponding mechanisms. Large Eddy Simulation (LES) and permeable Ffowcs Williams-Hawkins (PFW-H) methods are used to predict cavitation noise around baseline and biomimetic hydrofoils. Results show that the wavy leading edge effectively reduces high-frequency noise but has little effect on low-frequency noise. The main source of low-frequency noise is cavity volume acceleration, while the wavy leading edge has little effect on it. High-frequency noise sources, related to surface pressure fluctuations and turbulence characteristics, are significantly suppressed by the wavy leading edge, thus decreasing high-frequency noise intensity. The wavy leading edge is found to be a promising technique for cavitation noise reduction. The study compares the noise characteristics of baseline and biomimetic hydrofoils. The wavy leading edge reduces high-frequency noise by suppressing surface pressure fluctuations and improving turbulence characteristics. However, it has little effect on low-frequency noise dominated by pseudo-thickness noise. The wavy leading edge limits cavity development to the trough region, playing a compartmentalization role. It does not suppress cloud cavitation but prevents its spread along the span. The wavy leading edge also reduces pseudo-loading noise by decreasing pressure fluctuations and modifying wake turbulence. The study concludes that the wavy leading edge primarily reduces high-frequency noise through these mechanisms.