NOVELTY - Culture medium comprises (in pts.wt.): rape straw stick (75-80), sea-buckthorn branches (25-30), rice bran (20-22), alfalfa (18-22), sunflower (13-15), jujube core powder (10-11), oil residue (6-7), gypsum powder (1-2), potassium dihydrogen phosphate (0.2-0.3), magnesium sulfate (0.3-0.4), glucose (1-2), urea (1-2), sodium alginate (0.4-5), mint leaves (2-3), Chinese magnolia vine fruit (1-2), guava leaves (1-2), cortex magnoliae officinalis (2-3), Corydalis (1.5-2.5), sweet potato starch (50-55), calcium propionate (0.5-0.6) and nutritional additive (10-12).    USE - Culture medium used for cultivating oyster mushroom (claimed).    ADVANTAGE - The culture medium cultivates oyster mushroom in a cost-effective and eco-friendly manner. The culture medium supplies cellulose, lignin, amino acid and microelement to the oyster mushroom.    DETAILED DESCRIPTION - Culture medium comprises (in pts.wt.): rape straw stick (75-80), sea-buckthorn branches (25-30), rice bran (20-22), alfalfa (18-22), sunflower (13-15), jujube core powder (10-11), oil residue (6-7), gypsum powder (1-2), potassium dihydrogen phosphate (0.2-0.3), magnesium sulfate (0.3-0.4), glucose (1-2), urea (1-2), sodium alginate (0.4-5), mint leaves (2-3), Chinese magnolia vine fruit (1-2), guava leaves (1-2), cortex magnoliae officinalis (2-3), Corydalis (1.5-2.5), sweet potato starch (50-55), calcium propionate (0.5-0.6) and nutritional additive (10-12). Nutritional additive comprises (in pts.wt.); bentonite (15-20), iron ore tailing powder (5-6), silkworm silk (0.2- 0.3) and citric acid residue (4-5). Bentonite and iron ore tailing powders are mixed in water with stirring and then heated at 450 degrees C for 2 hour to obtain a dried product. The dried product is ground to obtain powder, and then rest materials are mixed uniformly to obtain the finished product. An INDEPENDENT CLAIM is included for a method for preparing culture medium, which involves:    (A) crushing all components and extracting 5-6 times all herbal components in water in slow fire for 40-50 minutes and filtering to obtain slag; and    (B) mixing rest components with the slag, boiling them i a boiler to obtain a paste; and    (C) stirring uniformly the paste, sterilizing it at 20 degrees C for 121 minutes, cooling, solidifying, and then packaging in a polyethylene plastic bag to obtain final product.