Selenium-rich mushroom culture medium prepared from leftovers of fruits and vegetables

The invention discloses a selenium-rich mushroom culture medium prepared from leftovers of fruits and vegetables, and belongs to an edible mushroom culture medium. The selenium-rich mushroom culture medium is prepared from the following raw materials in parts by weight: 20-30 parts of potato skin, 20-30 parts of kiwi fruit peel, 10-20 parts of corn straw, 10-20 parts of corn cob, 5-20 parts of cottonseed hull, 5-20 parts of straw, 5-10 parts of oilseed rape stem, 5-10 parts of calcium sulphate, 1-7 parts of urea and 1-2 parts of bentonite. A preparation method of the selenium-rich mushroom culture medium comprises the following steps: respectively drying and grinding the potato skin, the kiwi fruit peel, the corn straw, the corn cob, the cottonseed hull, the straw and the oilseed rape stem; then uniformly mixing with the calcium sulphate, the urea, the bentonite and the water, stacking and fermenting for 6-8 days; ensuring that the humidity of the mixture is 60-65%, and the temperature of fermentation environ