Efficient refining preparation method of bamboo source L-lactic acid

The invention particularly relates to an efficient refining preparation method of bamboo-source L-lactic acid. The method specifically comprises the following steps: pretreatment, soda boiling, primary filtration, enzymolysis, fermentation and refining. The high-purity bamboo-source L-lactic acid is finally obtained through the process steps of pretreatment, soda boiling, primary filtration, enzymolysis, fermentation, refining and the like in sequence, meanwhile, soda boiling treatment is conducted under the high-temperature and high-pressure conditions, dissolution of cellulose and lignin can be accelerated, the reaction efficiency is improved, and the yield of the bamboo-source L-lactic acid is increased through the steps of filtration, washing and the like. The method has the advantages that impurities and residues can be effectively removed, the yield and purity of the bamboo-derived L-lactic acid are further improved, the method is worthy of being widely popularized in biological medicine and food indust