The invention relates to a production method of the feed fermented by straws, belonging to the feed production field with biological method; the production method mainly includes the following steps: preparing culture fluid with water, cane sugar and soy milk, or with water, cane sugar and animal blood; selecting strains; grinding the straws; placing the culture fluid in a fermenting tank for preincubation, then casting bacteria into the culture fluid after preincubation for once, and keeping the culture fluid in the fermenting tank for a period of time; putting the straw in the fermenting tank, and completely immerging the straw in the culture fluid; after 9 hours of stirring and continuous culture, using 4% of sodium hydroxide to adjust the pH value of the solution and drying. The method adopts bacteria to ferment and decompose various straws which are taken as feed raw materials to replace corn, thus the food grain consumption and pollution to the environment are reduced; in addition, the feed produced by the method has high nutritive value, short production period and wide scope of breeding objects.