The invention relates to fermentation waste vegetables feed and a preparation method. The fermentation waste vegetables feed consists of mixed raw materials and microorganism living bacteria liquid, wherein the mixed raw materials consist of vegetable waste materials, straw and corn powder; and each ton of the mixed raw materials are formed according to the weight ratio (w/w): 70 to 80 percent of waste vegetables, 20 to 25 percent of straw, and 4 to 6 percent of corn powder. Each ton of the mixed raw materials are added with 30 to 40 milliliters of the microorganism living bacteria liquid, and the content of living bacteria for the microorganism living bacteria liquid is between 1.0x10<9>cfu/mL and 1.0x10<11>cfu/mL. The fermentation waste vegetables feed and the preparation method have the advantages of reasonable formulation, scientific production method, wide applicable areas, simple operation, easy master, low cost, reasonable formula design, convenient production, suitability for broad peasant households and livestock breeding plants, safe and no toxity, and great adaptability to fermentation conditions, and can be used as feed of cows, sheep, geese, and so on, make full use of side products in agriculture industry, realize reasonable use of the resources, and provide new techniques for clean and sustainable agricultural industry.