Aerodynamic noise suppressor for fans, used to reduce the aerodynamic noise generated by fans in the environment. Suitable for the silencing of intake and exhaust ducts of various centrifugal and axial fans. The product is of impedance acoustic flow type. The design of the acoustic absorption panel structure and fluid passage is mainly based on the spectral characteristics data obtained from actual tests of noise sources of various fans in power plants, determining the required noise reduction at which frequency ranges. Additionally, a narrow rectangular passage with a large material surface is adopted to enhance the absorption effect.