The invention provides a nutritive lily bulb ferment and a preparation method thereof. Lily bulbs, mixed fruits and sugar are used as raw materials, and mixed strains are added for fermentation, so that the nutritive lily bulb ferment is prepared, wherein the mixed fruits are a mixture of blueberries, pitayas, kiwi fruits, grapes, mulberries and black funguses; the mixed strains are a mixture of saccharomyces cerevisiae, acetobacterium balch, lactobacillus acidophilus, bifidobacterium bifidum, bacillus coagulans and aspergillus candidus; the sugar is a mixture of any two of brown sugar, levulose, xylitol, white granulated sugar and malt sugar. According to the nutritive lily bulb ferment and the preparation method thereof disclosed by the invention, the defects existing in the prior art are overcome, the lily bulbs, the kiwi fruits, the blueberries and the mixed fruits are used as the raw materials for producing the nutritive lily bulb ferment with health-care functions, and the production technology is simple.