NOVELTY - Production of chromium-rich mushroom cultivation material comprises taking 40-50 pts. wt. beanstalk, 30-35 pts. wt. wood chips, 18-23 pts. wt. wheat bran, 0.8-1.2 pts. wt. plaster, 1-3 pts. wt. sucrose, and 2-5 pts. wt. 20% chromic chloride solution, crushing and adding water to 55-63% water content.    USE - Method for producing chromium-rich mushroom cultivation material (claimed).    ADVANTAGE - The mushroom can be a health food for chromium deficiency and supplements other essential trace elements.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for production of chromium-rich mushroom comprising:    (A) crushing cultivation materials, mixing, adding water, stirring;    (B) putting 0.9-1.1 kg culture material into each low-pressure polyethylene plastic bag having a diameter of 15 cm, thickness of 0.04 mm and length of 55 cm, sealing in sterilizing cooker at normal pressure, low heating at 100 degrees C for 10-12 hours, cooling to 65-70 degrees C and discharging;    (C) cooling culture material to 28 degrees C, inoculating;    (D) moving feeding tube in clean dry room after inoculation, stacking to a height of 80-90 cm, ventilating, turning 203 times, removing mixed fungi pollution part of cylinder material, overgrowing hyphae in cylinder bag after 40-50 days;    (E) peeling cylinder film, backing up the mushroom frame at an interval of 8-12 cm each bag, immediately covering film, and moisturizing; and    (F) removing bag after 3-5 days, maintaining inner film at 24-28 degrees C and air relative humidity at 85-90%, ventilating 2-3 times a day each time for half an hour when cylinder surface is covered with white fluffy fungus mycelium, lodging villiform mycelia, generating brown small water drops after 6-8 days, gradually thickening film, flushing water brown secretion, uncovering film at night, enlarging day and night for 3-5 days, growing surface layer of small protruding mushroom bud, continuously preserving heat and moisture, reinforcing and uncovering vent, and drying.