The invention discloses amino acid algae iodine salt and a preparation method thereof. The amino acid algae iodine salt comprises, by weight, 0.1-100 parts of amino acid algae iodine solutions, 800-1200 parts of edible salt, 0-200 parts of fruit-vegetable powder, 0-150 parts of marine animal products, 0-300 parts of cereals, 0-150 parts of spices, 0-150 parts of sugar, 0-300 parts of aginomoto, 0-100 parts of acid hydrolyzed vegetable protein flavoring powder, 0-100 parts of acid hydrolyzed vegetable protein flavoring solutions and 0-100 parts of yeast extracts. An ingredient mixture is mixed with the edible salt, and a mixture is obtained; and the amino acid algae iodine solution is added into a spray can and sprayed into the mixture, then the mixture is dehydrated through drying, and the amino acid algae iodine flavoring salt is obtained. According to the amino acid algae iodine salt and the preparation method thereof, an iodine enhancer used for compounded salt and salt-substitute products, namely the amino acid algae iodine solution, is added, the amino acid content is rich, nutritive value is high, the delicate flavor is strong, the taste is mild, small molecule peptide and inorganic iodine are contained, and the amino acid algae iodine salt is a healthy salt product; and in addition, the amino acid algae iodine flavoring salt prepared by the invention can replace the common edible salt, original cooking methods are not changed, and using is convenient and easy.