This paper investigates the noise reduction performance of biomimetic hydrofoils with wavy leading edges and the underlying mechanisms. Using Large Eddy Simulation (LES) and the permeable Flows Williams-Hawkins (PFW-H) method, the study predicts cavitation noise around baseline and biomimetic hydrofoils. The results show that the wavy leading edge effectively reduces high-frequency noise but has little effect on low-frequency noise. Further analysis reveals that the main source of low-frequency noise is cavity volume acceleration, while the wavy leading edge significantly suppresses high-frequency noise sources related to surface pressure fluctuations and turbulence characteristics. The study indicates that the wavy leading edge has significant potential for cavitation noise reduction.This paper investigates the noise reduction performance of biomimetic hydrofoils with wavy leading edges and the underlying mechanisms. Using Large Eddy Simulation (LES) and the permeable Flows Williams-Hawkins (PFW-H) method, the study predicts cavitation noise around baseline and biomimetic hydrofoils. The results show that the wavy leading edge effectively reduces high-frequency noise but has little effect on low-frequency noise. Further analysis reveals that the main source of low-frequency noise is cavity volume acceleration, while the wavy leading edge significantly suppresses high-frequency noise sources related to surface pressure fluctuations and turbulence characteristics. The study indicates that the wavy leading edge has significant potential for cavitation noise reduction.