NOVELTY - Cultivating Coprinus comatus comprises (i) preparing culture medium by taking poplar bark, wheat bran, corn powder, jujube pit, jujube pit sawdust mixture, urea, lime and gypsum, crushing the poplar bark and crushing jujube pit, uniformly stirring and mixing; (ii) loading the culture medium in a cultivation bag, sterilizing, and cooling; (iii) inoculating, culturing in a culture room, placing in a dark culture room, culturing the cultivation bag covered with mycelium; (iv) using UV-light to irradiate, maturing C. comatus; and (v) covering the bag, and harvesting.    USE - The method is useful for cultivating Coprinus comatus (claimed).    ADVANTAGE - The method: utilizes poplar bark to replace cotton seed hull; reduces production cost; does not affect natural environment; provides the C. comatus with high yield and stable quality.    DETAILED DESCRIPTION - Cultivating Coprinus comatus comprises (i) preparing culture medium by taking 15-30 pts. wt. poplar bark, 6-10 pts. wt. wheat bran, 10-15 pts. wt. corn powder, 20-30 pts. wt. jujube pit, 20-30 pts. wt. jujube pit sawdust mixture, 1-2 pts. wt. urea, 2-4 pts. wt. lime, and 2-4 pts. wt. gypsum, crushing the poplar bark and crushing jujube pit into 3-5 granules, uniformly stirring and mixing; (ii) loading the culture medium in a cultivation bag, sterilizing at 100-120 degrees C for 8-10 hours, and then transferring the sterilized cultivation bag to a clean cooling place for cooling; (iii) inoculating, conveying into a culture room for culturing, where the culture room is cleaned with bleaching powder, and sterilized, after inoculating the cultivation bag, placing in a dark culture room, maintaining temperature at 25-28 degrees C and air relative humidity to 85-95%, culturing the cultivation bag covered with mycelium for 10-15 days until fungus age reaches 55-60 days; (iv) reducing the culture room temperature to 10-20 degrees C, using UV-light having 1.5-2.5 mu w/cm2 intensity to irradiate for 3-8 minutes for every 2-4 hours, covering the whole culture medium with C. comatus mycelium, then adding inorganic zinc nutrition liquid to the culture medium for maturing C. comatus, managing air humidity by maintaining relative humidity in the culture room to 65-75%, managing ventilation in morning and evening once, where each time for 5-8 minutes, managing the temperature by controlling the culture room temperature during growing process to 15-18 degrees C, and after maturing, controlling the culture room temperature to 10-13 degrees C; and (v) covering the bag, and harvesting.