NOVELTY - Culture medium comprises 50-55 pts. wt. fungus residue, 40-45 pts. wt. sawdust, 20-22 pts. wt. bran, 18-21 pts. wt. furfural residue, 10-12 pts. wt. soybean, 9-11 pts. wt. white ash, 0.3-0.4 pts. wt. calcium oxide, 0.1-0.2 pts. wt. thiamine derived from garlic, 8-10 pts. wt. yellow mealworm, 9-11 pts. wt. calamine powder, 12-13 pts. wt. flour, 5-6 pts. wt. basalt powder, 0.1-0.2 pts. wt. nano-titanium dioxide, 2-3 pts. wt. brown sugar, 1-2 pts. wt. lime powder, 2-3 pts. wt. Gynostemma pentaphyllum, 3-4 pts. wt. Sterculia seed and 1-2 pts. wt. semen biotae shelled.    USE - Culture medium used for cultivating Pleurotus eryngii (claimed).    ADVANTAGE - The culture medium is prepared in a cost-effective and eco-friendly manner, and has increased ventilation property for Pleurotus eryngii.    DETAILED DESCRIPTION - Culture medium comprises 50-55 pts. wt. fungus residue, 40-45 pts. wt. sawdust, 20-22 pts. wt. bran, 18-21 pts. wt. furfural residue, 10-12 pts. wt. soybean, 9-11 pts. wt. white ash, 0.3-0.4 pts. wt. calcium oxide, 0.1-0.2 pts. wt. thiamine derived from garlic, 8-10 pts. wt. yellow mealworm, 9-11 pts. wt. calamine powder, 12-13 pts. wt. flour, 5-6 pts. wt. basalt powder, 0.1-0.2 pts. wt. nano-titanium dioxide, 2-3 pts. wt. brown sugar, 1-2 pts. wt. lime powder, 2-3 pts. wt. Gynostemma pentaphyllum, 3-4 pts. wt. Sterculia seed, 1-2 pts. wt. semen biotae shelled, 2-3 pts. wt. bracken, 45-47 pts. wt. modified sand and 10-11 pts. wt. nutritional additive. Modified sand comprises 40-42 pts. wt. sand, 2-3 pts. wt. urea and 18-19 pts. wt. flour, is prepared by dissolving urea into water (5-5.5 times) to obtain a solution. Remaining components are mixed and granulated to obtain granules and then solution is sprinkled on surface of granules. Nutritional additive comprises 3-4 pts. wt. cigarette head, 0.1-0.2 pts. wt. tea tree essential oil and 14-15 pts. wt. clay, is prepared by leaching cigarette head into water for 7-8 hours and filtered to obtain filter liquid. Remaining components are mixed with the filter liquid, granulated and dried to obtain nutritional additive. An INDEPENDENT CLAIM is included for a method for preparing culture medium, which involves:    (A) mixing brown sugar and lime powder in water (7-8 times) and stirring to obtain a mixture;    (B) adding remaining components in water and stirring, and then adding mixture, nutritional additive and modified sand to obtain culture medium; and    (C) sterilizing the culture medium at 100 degrees C and at normal pressure and then packaging in a polyethylene plastic bag to obtain final product.