NOVELTY - Preparing levulinic acid using a traditional Chinese medicine residue comprising starch, a blighted wheat, lily and Lotus seed, comprises grinding traditional Chinese medicine residue, passing through 20-120 mesh sieves, drying the water content in powder, adding disodium hydrogen phosphate and sodium dihydrogen phosphate, adding and stirring alpha -amylase and the residue in buffer solution, performing hydrolysis reaction and enzymolysis reaction for obtained liquid, and adding sodium hydroxide to the filter liquid.    USE - The method is useful for preparing a levulinic acid (claimed).    ADVANTAGE - The method prepares the levulinic acid with high efficiency in a cost-effective and environmental friendly manner.    DETAILED DESCRIPTION - Preparing levulinic acid using a traditional Chinese medicine residue comprising starch, a blighted wheat, lily and Lotus seed, where the starch quality content is less than 40%, comprises taking and grinding traditional Chinese medicine residue using wet process extracting method, passing through 20-120 mesh sieves, drying the water content in powder, adding disodium hydrogen phosphate and sodium dihydrogen phosphate in buffer solution in a mass ratio of 0.06-4.2:1 with a pH value of 5.5-7.5, adding and stirring alpha -amylase and traditional Chinese medicine residue in a mass ratio of 0.005-0.1:1 in a 10-100 g of buffer solution, performing hydrolysis reaction at a temperature of 50-75 degrees C for 1-12 hours to obtain the hydrolysis liquid, performing enzymolysis reaction for obtained hydrolysis liquid, removing the residue in obtained filtrate by adding dextrose content in the filter liquid, adding sodium hydroxide to the filter liquid to adjust the PH to 6.5-7.5, again adjusting pH value of the filtrate to 4.7-4.9 using citric acid, adding and stirring 5-60 address generation unit of Sephadex (RTM: Cross-linked dextran gel) and maltogenic amylase at 30-60 degrees C, a rotating speed of 20-300 revolutions per minute, performing hydrolysis reaction to the filter liquid by adding saccharifying enzyme for 2-72 hours adding 98 wt.% of sulfuric acid solution to obtain glucose solution with mass concentration of 0.1-10%, and adding the glucose acid solution into a reaction kettle and stirring while adding 5-18 g/l of reaction mixture at a temperature of 140-190 degrees C and a rotating speed of 100-600 rpm for 10 hours.