Method for preparing high-purity lutein crystals by biological process

The invention discloses a method for preparing high-purity lutein crystals by a biological process, belonging to the field of lutein. The method comprises the following steps: extracting a lutein crude product from marigold, carrying out biofermentation, and carrying out purification to obtain the high-purity lutein crystals. The biological process has the advantages of high selectivity, favorable catalytic effect, mild conditions, simple technique, low solvent residue level in the preparation process, and low environmental pollution. The obtained product has the advantages of high purity and low cost, and has wide application prospects.