NOVELTY - Method for cultivating mushroom, involves adding water to mushroom tang particles, soaking mixture, extracting the mixture, adding cottonseed hulls and soybean to the mixture, preparing pile, naturally fermenting, turning once, adding lime and gypsum to the mixture, further turning the mixture, maintaining the mixture, controlling the moisture content, performing fruiting management, harvesting mushroom depending on mycelial growth, and spraying 0.01-0.02 g/ml mushroom tang extract.    USE - The method is useful for cultivating mushroom (claimed).    ADVANTAGE - The method promotes beneficial microorganism breeding, improves microbial florae in the materials, accelerates catalytic decomposition of the cultivation materials, provides high biotransformation rate, saves resources such as labor and coal, and is environmentally-friendly.    DETAILED DESCRIPTION - Method for cultivating mushroom, involves (a) obtaining 72-78% cottonseed hull, 16-20% soybean, 3-4% mushroom tang, 2-3% lime and 1% gypsum, where the mushroom tang is obtained from shiitake mushroom, and pulverized into particles of 2-3 mm, (b) adding 20-30 times water to the mushroom tang particles, soaking the mixture at room temperature for 18-24 hours, extracting the mixture, adding cottonseed hulls and soybean to the mixture, preparing pile at height of 1-1.2 m and width of 2-3 m, naturally fermenting the mixture, maintaining the mixture at 60 degrees C for 24 hours, turning once, adding lime and gypsum to the mixture, further turning the mixture for 3-4 times, maintaining the mixture for 5-6 days, controlling the moisture content to 63-65%, and performing fruiting management, and (c) harvesting mushroom depending on mycelial growth, and spraying 0.01-0.02 g/ml mushroom tang extract, where the mushroom tang extract is prepared by adding 20 times water to mushroom tang particles, soaking the mixture at room temperature for 18-24 hours, filtering the extract, adding water to the filtrate, and concentrating the mixture.