The present invention relates to a skin anti-aging composition containing Irilin B (5,7,2'-trihydroxy-6-methoxyisoflavone) or a salt thereof, wherein Irilin B isolated fromSalicorniaspp. may be used itself or in the form of a salt thereof, and shows effects of enhancing skin elasticity, preventing and reducing wrinkles, or maintaining skin moisturization. The skin anti-aging composition of the present invention can be prepared in various forms, such as a cosmetic composition, a food composition, a feed composition, or a pharmaceutical composition.
