The invention relates to an ecological fermented feed and a preparation technology thereof. The ecological fermented feed consists of the following raw materials in parts by weight: 10-50 parts of grass meal, 20-60 parts of corn sugar dregs, 10-50 parts of bran, 5-45 parts of cottonseed meal, 10-50 parts of potato starch dregs, 5-30 parts of molasses, 0.01-10 parts of ruminant multiple vitamins, 0.1-20 parts of ruminant multiple minerals, 0.1-10 parts of activation bacterial liquid and 5-60 parts of sodium humate. The feed prepared by the preparation technology disclosed by the invention can supply collocation of a concentrated feed and a coarse feed and nutrient substances of protein, energy, vitamins, minerals and the like required for growth of cattle and sheep in a balanced manner, sothat animals of mutton sheep, cows and the like can grow quickly and are good in meat quality in winter and spring, and the ecological fermented feed has the advantages of being low in cost and easy to store; and besides, the pressure of a grassland can be relieved, ecological damage is reduced, dust storm is prevented and controlled, environment is further protected, and the ecological fermentedfeed has important significance in sustainable development of animal husbandry in China.