NOVELTY - Cultivating Pleurotus eryngii using marsh gas residue comprises taking normal gas production digester liquid, directly remove marsh gas residue, naturally draining, adding raw water, and stirring to obtain main material; mixing the straw and rapeseed shell with main material; stacking the mixed material, turning the material, adding ammonium bicarbonate and calcium magnesium phosphate into the stockpile, turning the material evenly, retting; and planting.    USE - The method is useful for cultivating Pleurotus eryngii using marsh gas residue (claimed).    ADVANTAGE - The method is environmentally-friendly.    DETAILED DESCRIPTION - Cultivating Pleurotus eryngii using marsh gas residue comprises (i) taking culture medium comprising 500 kg straw, 50 kg rapeseed shell, 500 kg biogas residues, 7.5 kg ammonium bicarbonate, 10 kg FCMP, 25 kg oil dry powder, 2 kg gypsum powder and 400 kg water; (ii) taking normal gas production digester liquid, adjusting the pH to 7, directly remove 500 kg marsh gas residue, naturally draining, after 7-15 days, adding raw water into the biogas residues, and stirring to obtain main material; (iii) mixing the straw and rapeseed shell with main material and controlling the moisture content to 60-65%; (iv) stacking the mixed material into long heap having width of 5 m and height of 0.8-1.2 m, after 7 days, placing a thermometer in the central stockpile, if the temperature is 75 degrees C, turning the material, adding ammonium bicarbonate and calcium magnesium phosphate into the stockpile, turning the material evenly, retting the pile for 5-6 days, when the temperature rises to 80 degrees C, stacking second time, adding oil cake flour and gypsum powder, and retting for 3-4 days; and (v) planting: (a) spreading the stockpile, adjusting the Ph to 7.5, and cooling to 25 degrees C, (b) sprinkling 15-20 cm thickness base material and bacteria on the mushroom house ground, closing the mushroom house, maintaining indoor temperature at 25-28 degrees C, relative humidity of 85-90%, culturing for 5-6 days, and leaving for spawn period, and (c) spraying disinfectant once every three days, detecting the contamination in the mushroom bag in a timely manner and removing; and (vi) when the mushroom bud grows, harvesting, carrying out fruiting period, maintaining the mushroom house temperature at 15-20 degrees C and air humidity to 85-95%.