NOVELTY - Cultivating shimeji mushroom comprises: adding clean water into mushroom stem particles and soaking at room temperature, adding the mushroom stem along with soaking liquid into bagasse and soybean cake for pre-wetting, then piling to ferment, sowing shimeji mushroom; harvesting the mushroom, spraying mushroom stem leachate, spraying 5-8 kg/m2 to rejuvenate mycelium, where the mushroom stem leachate is prepared by soaking the mushroom stem in 20 times amount of 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 shimeji mushroom (claimed).    ADVANTAGE - The method is environmentally-friendly, economical and saves labor.    DETAILED DESCRIPTION - Cultivating shimeji mushroom comprises: (a) taking 78-82% bagasse, 10-14% soybean cake, 3-4% mushroom stem, 3-4% lime and 1% gypsum as dry raw materials, where the bagasse is dried and crushed into 3-5 mm granules, and the mushroom stem is shiitake mushroom stem residue, which is dried and crushed into particles of 2-3 mm; (b) adding 20-30 times clean water into mushroom stem particles and soaking at room temperature for 18-24 hours, adding the mushroom stem along with soaking liquid into bagasse and soybean cake, 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, 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 bran, 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 shimeji mushroom spawn, cultivating, then carrying out routine fruiting body management when the mycelium covers the material layer; and (c) harvesting the mushroom, spraying 0.01-0.02 g/ml mushroom stem leachate, spraying 3-5 kg/m2 to rejuvenate mycelium, where the mushroom stem leachate is prepared by soaking the mushroom stem in 20 times amount of water for 18-24 hours, filtering the residue, making up to its original volume to obtain 0.05 g/ml dilution.