NOVELTY - Culturing Agrocybe mycelium for extracting Agrocybe polysaccharide comprises e.g. providing e.g. Agrocybe, corn core, wheat bran, and tea seed cake, smashing Agrocybe, corn core, mixing, carrying out enzyme biodegradation treatment for preparing biodegradable base material, adding biodegradable base material with e.g. wheat bran and tea seed cake, mixing, preparing planting substrate material, packaging and sterilizing mushroom sticks, inoculating, managing hyphal growth, harvesting mycelium, directly entering for polysaccharide extraction.    USE - The method is useful for culturing Agrocybe mycelium for extracting Agrocybe polysaccharide (claimed).    ADVANTAGE - The method can realize conversion of crude macromolecular structure of lignocellulose into lignocellulosic small fine molecular structure, facilitates easy culturing of mycelia, improves the biotransformation utilization rate in the mycelia culturing stage by 70%, shortens the mycelium incubation time, improves production efficiency, reduces the production cost, comprehensively utilizes industrial and agricultural waste, and is environmentally friendly.    DETAILED DESCRIPTION - Culturing Agrocybe mycelium for extracting Agrocybe polysaccharide comprises (i) providing Agrocybe, corn core, wheat bran, urea, white sugar, tea seed cake, and light calcium carbonate, (ii) material pre-processing: smashing Agrocybe, corn core into 0.3-0.5 cm sized particles, mixing smashed Agrocybe and corn core, carrying out cellulase enzyme biodegradation treatment for preparing biodegradable base material, (iii) adding biodegradable base material with wheat bran, urea, white sugar, light calcium carbonate, and tea seed cake, using water to adjust water content to 50-60%, pH value to 7-7.5, stirring and mixing uniformly, preparing planting substrate material, (iv) packaging and sterilizing: packaging planting substrate material into mushroom stick, where the upper and lower has consistent elasticity, placing packed mushroom stick in a sterilization cooker for sterilizing, vigorously and quickly raising the temperature to 100 degrees C and maintaining for 48 hours, within four hours packaging and preparing into mushroom sticks and sterilizing, (v) inoculating culture: stopping cooling to below 28 degrees C, using same number of mushroom sticks to the same batch after inoculation is completed, placing vertical sticks in spawn room and performing stacked arrangement, covering film, allowing to stand for one week, ventilating one hour every morning, (vi) managing hyphal growth: 7-15 days after inoculation, moving mushroom stick into hyphae growing temperature control room of 24-27 degrees C, when mycelium diameter reaches 4-5 cm, first time turning and penetrating hole, each mushroom stick penetrating hole is 15-20, after mycelium reaches full length, second time penetrating hole, each mushroom stick penetrating hole is 35-45, penetrating hole temperature is controlled at 25-28 degrees C, after turning penetrating hole, stacking into triangle, where the height does not exceed ten layer, and (vii) when the mushroom logs form a compact mycelium, harvesting mycelium from the bag, directly entering for Agrocybe polysaccharide extraction process, and can also be dried for further use.