The invention discloses a fatigue-resistant vibrating plate for a loudspeaker. The fatigue-resistant vibrating plate at least comprises a combination of polyacrylonitrile, sago cycas pulp and carbon fiber. According to the scheme, a material formula of a conventional vibrating plate is improved, and the sago cycas pulp and modified fiber are introduced, so that the defect of poor moisture resistance of the vibrating plate in the prior art is overcome effectively. Moreover, the sago cycas pulp and the fiber are improved together, so that the vibrating plate has superior structural strength, corrosion resistance and fatigue resistance, and the loudspeaker can keep relatively high fullness for a long time on a full band. Thus, distortion of the loudspeaker is restrained greatly, and the tone quality of the loudspeaker is enhanced.