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