The invention relates to the technical field of skin care products, and particularly discloses astaxanthin antioxidant essence and a preparation method thereof. The preparation raw materials at leastcomprise 1.1-4.3 parts of an antioxidant, 6.1-20.5 parts of a humectant, 0.5-2 parts of a softening and moistening agent, 1-3 parts of an emulsifier, 0.05-0.5 part of a preservative, 0.5-2.5 parts ofa bacteriostatic agent, 0.5-2 parts of a chelating agent, 0.1-0.3 part of a thickening agent and 50-70 parts of water. The prepared essence contains various moisturizing components, and can effectively help skin in absorption, increase skin elasticity, keep skin moisture, soften dry and aged cutin on the skin surface, soften and fine the skin, protect the skin and prevent dryness, and can make theskin soft and glossy, improve the skin and keep the skin healthy. Besides, through effective cooperation of multiple auxiliaries, astaxanthin components are more stable, can quickly penetrate throughthe skin and are effectively absorbed and utilized by the skin, so that the skin achieves antioxidant, anti-inflammatory and anti-aging effects.