Method for extracting octacosanol by using sugar refinery mixing juice floating residue as raw material

The present invention relates to an octacosanol extraction method, specifically to a method for extracting octacosanol by using sugar refinery mixing juice floating residue as a raw material. The method comprises: separating and drying sugar refinery mixing juice floating residue, extracting sugarcane wax from the dried floating residue, treating the sugarcane wax by using an alcohol phase saponification method, and carrying out re-crystallization purification on the product obtained by treating the sugarcane wax through the alcohol phase saponification method. According to the present invention, the sugar refinery mixing juice floating residue is adopted as the raw material to extract the octacosanol, such that the raw material supply is sufficient, the octacosanol content is high, and no transportation secondary pollution exists; the application of the sugar refinery mixing juice floating residue to extract the octacosanol is the extension of the sugar refinery industry chain and is the sugar refinery expanding depth comprehensive development direction, the valuable resources are recycled, the enterprise benefits and the employee benefits are increased, the enterprise competitiveness is enhanced, the sustainable development of the sugar industry is ensured, and the good application prospect is provided.