The invention discloses a method for production of cattle and sheep complete feed by twice fermentation of bagasse as the raw material. The cattle and sheep complete feed is prepared from the following raw materials by weight: 50-85 parts of bagasse, 10-15 parts of a plant material, 8-10 parts of corn flour, 5-8 parts of bean dregs, 5-8 parts of rice bran, 0.1-1 part of fermentation strain, and 0.1-0.3 part of trace elements. The plant material includes one of sugarcane tail end, cassava stem leaves, fresh pasture, wheat straw, rice straw, corn stalk, paper mulberry, peanut vine and weed or is a mixture of more than one of the substances. The method provided by the invention takes the sugar factory by-product bagasse for fermentation to prepare the cattle and sheep feed, belongs to a leftover recycle project and turns "waste" into wealth, does not discharge waste residue, and is green and environment-friendly. The making method is simple and low in cost. The cattle and sheep feed obtained by fermentation has comprehensive nutrition and fragrant and sweet taste, and improves the appetite of cattle and sheep, so that cattle and sheep can like eating and grow quickly.