NOVELTY - Cultivation of Coprinus comatus involves taking rice straw, cow dung, cottonseed hull, mushroom stem, lime, gypsum and calcium superphosphate, adding mushroom particles with 20-30 times the weight of water, soaking at room temperature for 18-24 hours, mixing with leaching solution, adding manure, mixing, piling at height of 1.2-l.5 m and width of 2-3 m where weight for each heap of materials is controlled to 300-500 kg, inserting sticks, covering with grass, turning for 3-4 times (12-15 days), adding water, fermenting, cooling and spraying with 0.005-0.01 g/ml mushroom extract.    USE - Method for cultivating Coprinus comatus (claimed).    ADVANTAGE - The method is energy-saving and environment-friendly.    DETAILED DESCRIPTION - Cultivation of Coprinus comatus comprises:(1) taking 58-68 wt.% rice straw, 12-16 wt.% cow dung, 14-16 wt.% cottonseed hull, 3-4 wt.% mushroom stem, 2.5 wt.% lime, 1 wt.% gypsum and 1 wt.% calcium superphosphate;(2) adding mushroom particles with 20-30 times the weight of water, soaking at room temperature for 18-24 hours, mixing with leaching solution, adding manure and mixing;(3) piling at height of 1.2-l.5 m and width of 2-3 m where weight for each heap of materials is controlled to 300-500 kg, inserting sticks with diameter of 10-15 cm where porosity is 1 g/m3 and covering with grass;(4) turning for 3-4 times (12-15 days), adding water to moisture content of 63-65%, fermenting, cooling and covering material layer to thickness of 2-3 cm; and(5) spraying with 0.005-0.01 g/ml mushroom extract where amount of mushroom extract sprayed per square meter is 5-6 kg. The straw is rice straw, wheat straw, corn stalk, rape straw and/or cassava stem obtained by drying and crushing into 3-5 cm small pieces. Mushroom stem is leftover mushrooms obtained by drying and crushing into granules. The leaching solution is prepared by adding mushrooms particles with 20 times the weight of water, soaking at room temperature for 18-24 hours, filtering and diluting with water to concentration of 0.05 g/ml.