The invention discloses an ocean health care capsule having efficacy of lowering blood sugar. The capsule is prepared by scientific compatibility of astaxanthin and raw materials of Chinese herbal medicine, preferably, the capsule is prepared from the following ingredients in parts by weight: 30-40 parts of astaxanthin, 15-20 parts of chitosan, 15-18 parts of medlar, 10-14 parts of corn stigma, 8-10 parts of rehmannia root, 8-10 parts of liquorice, 6-10 parts of semen cassiae, 4-8 parts of rhizoma atractylodis macrocephalae, 5-8 parts of medicated leaven, 4-6 parts of platycodon grandiflorus, 4-6 parts of rhizoma anemarrhenae, 4-6 parts of phyllanthus emblica, 3-5 parts of herb of common seepweed and 2-3 parts of stevia rebaudiana, and then the capsule is prepared according to the process of mixing, blending, sterilizing and filling. The product has the advantages that by the synergistic effect of the chitosan, the astaxanthin and the Chinese herbal medicine, the product has the efficacy of remarkably lowering blood sugar, tonifying Qi, supporting the healthy energy, resisting fatigue, prolonging life and the like, the product is safe, has no side effect, is convenient to eat and has a good market application prospect.