The invention belongs to the technical field of cosmetics, and discloses an anti-aging repairing agent and a preparation method thereof.The anti-aging repairing agent is prepared from, by weight, 50-100 parts of beta-nicotinamide mononucleotide, 5-25 parts of fenugreek essential oil, 5-25 parts of camellia oil, 5-12 parts of sodium hyaluronate, 1-15 parts of squalane, 50-100 parts of an anti-inflammatory agent, 20-40 parts of an antioxidant, 5-15 parts of a softening and moistening agent, 1-10 parts of a surfactant and 100-150 parts of water. By adding natural plant components, reducing the use amount of beta-nicotinamide mononucleotide and through the synergistic effect of all the components, the advantages of traditional Chinese medicine / medicinal and edible plants are fully played, skin inflammation caused by light aging is avoided or delayed, meanwhile, damage of free radicals caused by ultraviolet rays to the skin can be avoided and repaired, and the skin care effect is achieved. Therefore, the excellent anti-aging effect of the product is ensured, and the anti-aging effect is effectively realized.