NOVELTY - The method comprises: performing a process flow for hydrolyzing a dried substance by cleaning a yam raw material for removing the mud attached to a surface and the sand, adding the raw material into a crusher for crushing to a volume ratio, preparing a slurry, where a ratio of the added water is 30% of the raw material, flowing the formed slurry into a buffer groove, placing the material into a pin mill for grinding until reaching 80-100 meshes, adjusting the pH value of the slurry to 5-5.5 using sulfuric acid with 3 mass%, and uniformly stirring the slurry.    USE - The method is useful for hydrolysis extraction of yam diosgenin.    ADVANTAGE - The method allows economical and rapid hydrolysis extraction of yam diosgenin with high purity and reduced energy consumption and without fermentation in an environmentally friendly manner.    DETAILED DESCRIPTION - The method comprises: performing a process flow for hydrolyzing a dried substance by cleaning a yam raw material for removing the mud attached to a surface and the sand, adding the raw material into a crusher for crushing to a volume ratio, preparing a slurry, where a ratio of the added water is 30% of the raw material, flowing the formed slurry into a buffer groove, placing the material into a pin mill for grinding until reaching 80-100 meshes, adjusting the pH value of the slurry to 5-5.5 using sulfuric acid with 3 mass%, uniformly stirring the slurry, placing the slurry into a belt-type squeezer for squeezing the slurry under a condition of 0.2 Mpa to separate out cellulose and slurry, collecting the squeezed slurry in a new buffer groove, buffering the slurry, horizontally and spirally centrifugalizing the slurry in a centrifugal machine at 4700 revolution per minute for 4-6 minutes for separating the slurry, filter pressing by a diaphragm to a ratio of cellulose to centrifugalized solution of 2:3, mixing the separated cellulose with the centrifugalized solution for forming a mixture, filtering the mixture by a diaphragm filter press, pressing the mixture into a block-shaped filter cake with solid content of greater than 40% and then stirring to dissolve, dissolving the filter cake in sulfuric acid solution with 30 mass% to a certain ratio of filter cake to acid solution of 1:1.5 and then centrifuging, stirring the discharged acid waste solution uniformly for forming an acid split solution, adding the acid split solution into a diaphragm filter press for deacidifying, pressing the solution into a filter cake with solid content of greater than 30%, collecting the filtered waste acid solution into a hydrolyzed acid solution storage tank, circularly cleaning the filter cake for deacidifying the filter cake until the pH value of the effluent is neutral, pressing the filter cake into a dried filter cake with solid content of greater than 50%, centrifugally dehydrating the dried filter cake, crushing the filter cake by a crusher into small particles with diameter of greater than 1 cm, and placing the filter cake in a drying room to dry for 22-26 hours under a condition of greater than 80 degrees C for obtaining the hydrolyzed dried substance; and performing a process flow for extracting diosgenin by performing solvent extraction, adding the hydrolyzed dried substance into an extracting tank, adding into 120# solvent oil, where a ratio of the hydrolysate to the solvent oil is 1:4, heating the 120# solvent oil in the extracting tank at 85-95 degrees C by steam and then continuously reflowing for extracting the substance for 6-8 hours, forming a diosgenin solvent by the diosgenin and the 120# solvent oil, distilling the diosgenin solvent until reaching a volume ratio of the diosgenin to the solvent oil of 1:40, adding the diosgenin solvent into a crystallizing tank for crystallizing the diosgenin for more than 24 hours for obtaining crystalline liquid at greater than 20 degrees C, placing the crystalline liquid into a centrifugal machine for separating the crystalline liquid, washing the crystalline liquid by the 120# solvent oil, filtering the oil and introducing the oil into an oven, drying the oil and taking out the product, and crushing the product until reaching 300 meshes for obtaining the finished product yam diosgenin. The grinding and squeezing step comprise removing the large particle impurities by a vibrating sieve. The large particle impurities are granular substances with a particle size of greater than 80 meshes. The step of horizontally and spirally centrifugalizing the slurry comprises placing the slurry obtained onto a vibrating sieve for removing the residual fiber in the slurry and then placing the slurry in a buffer groove for buffering and precipitating the slurry, separating the slurry, and buffering the slurry for 24 hours. The step of circularly cleaning the filter cake for deacidifying the filter cake comprises cleaning the filter cake using multi-level circulating water. The squeezer is a belt-type squeezer. The centrifugal machine is a horizontal and spiral centrifugal machine.    DESCRIPTION OF DRAWING(S) - The figure shows a flowchart of a method for hydrolysis extraction of yam diosgenin (Drawing includes non-English language text).