The present invention relates to a solid rocket motor seal life prediction method based on a seal life cycle. The method specifically comprises: 1) determining an aging model under a rubber normal temperature; 2) determining a compression deformation rate after a rubber seal ring is aged; 3) determining a compression deformation rate after the rubber seal ring is aged and rebound; 4) determining an engineering stress of the rubber seal ring when a solid rocker motor is operated; 5) determining a life prediction model of the solid rocket motor based on a seal life cycle; and 6) determining aging storage time under a maximum allowable leak rate. According to the method, on the basis of a rubber aging model, a relation between a seal ring compression permanent deformation rate and a compression deformation rate, a simplified seal ring rebound model, a rubber Mooney-Rivlin model and an asbestos rubber leakage rate model, the storage life of the solid rocket motor can be effectively predicted, maintenance of the stored solid rocket motor is facilitated, and secure and reliable operation of the solid rocket motor is ensured.