The invention discloses a preparation method and application of an amino acid chelated zinc modified Laem Tencel fiber, which is obtained through the esterification reaction of amino acid chelated zinc and Laem Tencel fiber, including ligand amino acid and zinc nitrate at a reaction temperature of 50 ℃ The chelation reaction was carried out under the conditions of ‑65℃ and pH value of 4‑7, the reaction product was precipitated by adding absolute ethanol, centrifuged and dried to obtain amino acid chelated zinc, which was dissolved in a fibrinolytic aqueous solution with cellulose pulp, Under the conditions of -130℃ and vacuum stirring, the esterification reaction was carried out for 3-4 hours to obtain the spinning solution, which was filtered and deaerated, and then wet-spun, solidified and formed in the spinning bath to obtain amino acid chelated zinc-modified ramie Tencel fiber. In the invention, the amino acid chelated zinc-modified lamina tencel fiber can improve the antioxidant property, has a good free radical scavenging effect, and can be used in the field of mask base cloth.