NOVELTY - Production of a microbial grease comprises crushing agricultural wastes to 20-100 meshes, adding a hydrolysis acid solution, hydrolyzing for 1-3 hours at 110-140 degrees C to obtain a hemicellulose hydrolysis solution; carrying out detoxification pre-treatment; preparing a fermentation medium by concentrating the hydrolysis solution at 60-70 degrees C, adding peptone, dusty yeast, and magnesium sulfate heptahydrate, and sterilizing; and inoculating a seed solution of Trichosporon pullulans to the medium for 7-9 days at 25-28 degrees C, and carrying out organic solvent extraction.    USE - Method for the production of a microbial grease (claimed).    ADVANTAGE - The method has wide source of raw material, and is inexpensive, simple, and easy. It achieves high-value utilization of the hemicellulose in the agricultural wastes to reduce the production cost of the microbial grease.    DETAILED DESCRIPTION - Production of a microbial grease comprises hydrolyzing hemicellulose by crushing agricultural wastes into powders of 20-100 meshes, adding a hydrolysis acid solution based on a solid-liquid ratio of 1 g:10-20 mL, hydrolyzing the agricultural wastes for 1-3 hours at 110-140 degrees C to obtain a hemicellulose hydrolysis solution; carrying out detoxification pre-treatment by calcium hydroxide (Ca(OH)2) treatment comprising adding Ca(OH)2 powders to the hydrolysis solution, adjusting the pH of the system to 10-12, keeping for 1-1.5 hours, filtering the system and adjusting the pH of the filtrate with an acid to 5.5-6, standing the filtrate for 1-2 hours, and centrifuging for 10-20 minutes to remove the precipitate, and by absorption treatment comprising active carbon absorption, ion exchange resin absorption, or macroporous resin absorption; preparing a fermentation medium by concentrating the hydrolysis solution at a pressure reduction condition and at 60-70 degrees C until the concentration of the reducing sugar is 80-120 g/L, adding (g/L) peptone (1.2-2.4), dusty yeast (0.25-0.75), magnesium sulfate heptahydrate (0.4-0.6), potassium dihydrogen phosphate (1.5-2.5), manganese sulfate hydrate (0.003-0.005), and copper sulfate pentahydrate (0.0001-0.0002), adjusting the pH of the system to 6-6.5, and sterilizing; and inoculating the seed solution of Trichosporon pullulans to the fermentation medium at a volume ratio of 5-15:100 to culture the medium for 7-9 days at 25-28 degrees C, centrifuging the medium and collecting the thalli, and carrying out organic solvent extraction. Active carbon absorption comprises adding active carbon to the hydrolysis solution based on a solid-liquid ratio of 1 g: 5-10 mL, stirring for 1-2 hours at 30-40 degrees C, filtering the system, and removing the active carbon. Ion exchange resin absorption comprises adding ion exchange resin to the hydrolysis solution based on a solid-liquid ratio of 1 g: 5-10 mL, stirring for 1-2 hours at 30-40 degrees C, filtering, and removing the ion exchange resin. Macroporous resin absorption comprises adding macroporous resin to the hydrolysis solution based on a solid-liquid ratio of 1 g: 5-10 mL, stirring for 1-2 hours at 30-40 degrees C, filtering, and removing the macroporous resin. BIOTECHNOLOGY - Preferred Method: Organic solvent extraction comprises adding 10 mL HCl with a concentration of 3.5-4.5 mol/L to every gram of dry thalli for 30-60 minutes at 80-100 degrees C, cooling, adding a mixed solvent of chloroform and methanol at a volume ratio of 2:1 to extract the thalli, collecting the chloroform layer, and removing the organic solvent with a rotary evaporator through reduced pressure. INORGANIC CHEMISTRY - Preferred Component: The hydrolysis acid is sulfuric acid, hydrochloric acid, or phosphoric acid. The acid in the Ca(OH)2 treatment is sulfuric acid, hydrochloric acid, or phosphoric acid. The acid for adjusting the pH of the system in the preparation of the fermentation medium is sulfuric acid, hydrochloric acid, or phosphoric acid. Preferred Concentration: The concentration of the hydrochloric acid is 4 mol/L. ORGANIC CHEMISTRY - Preferred Component: The agricultural wastes include rice straws, wheat straws, sorghum straws, or straws, bagasse, or corncobs.