The invention relates to a skin moisturizer and belongs to the technical field of skin care. The skin moisturizer comprises components namely a moisturizing composition, fatty acid ester, annular silicone oil, isopropyl palmitate, lecithin, diphenol, palmitic acid, carbomer, glycerin, triethanolamine, butylene glycol, lubrajel, olive oil and sodium hyaluronate. The moisturizing composition comprises a bamboo extract, a composite seaweed extract, a thyme extract, a ginseng extract, a cinnamon extract, a garlic extract, the butylene glycol, a preservative and water. The invention provides the moisturizing composition prepared from a plant extract essence, and moisturizing cream and a maintaining agent prepared from the moisturizing composition. Aiming at the reasons for skin aging, the skin moisturizer can effectively cure dry skin and retard skin moisture loss by comprehensively moisturizing the skin. Moreover, the moisturizing composition smells fragrant, and the moisturizing cream prepared from the moisturizing composition is good in use feeling, fresh, fragrant, and easy to accept.