The invention discloses a method for backward inferring Young modulus of a loudspeaker through resonant frequency of a vibrating part of the loudspeaker and belongs to the field of loudspeaker design and manufacture as well as material parameter measurement. The method comprises: firstly, obtaining the resonant frequency f0 of the vibrating part of the loudspeaker by virtue of a measuring method; then obtaining the resonant frequency f0' of the vibrating part by adopting a simulation analysis method, comprising the steps of establishing a geometric model, establishing a simulation analysis model, carrying out modal analysis and solution and the like; and finally backward inferring the Young modulus of the vibrating part material through the resonant frequency f0 and f0'. The method disclosed by the invention is helpful for an electroacoustic engineer to relatively accurately obtain the material characteristics of the vibrating part of the loudspeaker, so that the loudspeaker is designed and manufactured better.