NOVELTY - Cultivating shiitake mushroom comprises: adding clean water into mushroom stem particles and soaking at room temperature, adding the mushroom stem with soaking liquid into bagasse, sawdust and soybean meal for pre-wetting, then piling to ferment, sowing shiitake mushroom; harvesting the mushroom, spraying mushroom stem leachate, spraying 5-7 kg/m2 to rejuvenate mycelium, where the mushroom stem leachate is prepared by soaking the mushroom stem in water for 18-24 hours, filtering the residue, making up to its original volume to obtain 0.05 g/ml dilution.    USE - The method is useful for cultivating shiitake mushroom (claimed).    ADVANTAGE - The method: promotes third and fourth mushroom ear biotransformation rate; saves man-power, coal and other resources; and satisfies low-carbon environmental protection concept.    DETAILED DESCRIPTION - Cultivating shiitake mushroom comprises taking 45-55% cotton seed hull, 24-34% sawdust, 12-14% soybean meal, 4-5% shiitake mushroom stem, 2-3% limestone, and 1% gypsum as raw materials, where the sawdust has diameter of 3-5 mm, and the shiitake mushroom stem is shiitake mushroom waste; (ii) adding 20-30 times clean water into mushroom stems, particles and soaking at room temperature for 18-24 hours, adding the shiitake mushroom stem along with soaking liquid into bagasse, cotton seed hulls, sawdust and soybean meal, then piling to a height of 1-1.2 m and a width of 2-3 m, controlling dry weight to 300-500 kg, providing vent of 10-15 cm using a stick with a pore density of 1/m3, and allowing it to ferment naturally, turning once when the temperature reaches 60 degrees C until 24 hours, turning once a day, adding lime and gypsum, turning, then adding limestone and gypsum, totally turning for 3-4 times in 5-6 days, stopping the fermentation, adjusting the moisture content to 63-65%, cooling the fermented cultivation material, seeding the shiitake mushroom, cultivating, covering soil particles 1 cm thickness, then carrying out routine fruiting body management when the mycelium covers the material layer; and (iii) harvesting the mushroom, spraying 0.01-0.02 g/ml mushroom stem leachate, spraying 5-7 kg to rejuvenate mycelium, where the mushroom stem leachate is prepared by soaking the mushroom stem particles in 20 times amount of water for 18-24 hours, filtering the residue, making up to its original volume with water to obtain 0.05 g/ml dilution.