Application of rhizoma sparganii extract in preparation of external preparation for skin after-sun repair

The invention belongs to the technical field of cosmetics, and particularly relates to application of a rhizoma sparganii extract in preparation of an external preparation for skin after-sun repair. The rhizoma sparganii extract prepared by the invention can scavenge free radicals, inhibit lipid peroxidation, inhibit the production of ROS and down-regulate the expression of AGEs, and also can inhibit inflammatory reactions induced by ultraviolet rays, reduce the expression of NF-kappa B and HMGB1 genes up-regulated by the ultraviolet rays, inhibit the secretion of inflammatory factors TNF-alpha, inhibit the growth of tumors, inhibit the growth of tumors, inhibit the growth of tumors and inhibit the growth of tumors. Meanwhile, expression of alpha-MSH and beta-catenin genes which are up-regulated by ultraviolet rays can be reduced, generation of melanin and transport of melanosomes can be inhibited, and in other words, the symptoms of skin after-sun injury can be remarkably relieved by improving multiple signa