The invention discloses low-cost beef cattle fattening concentrate supplement free of corn and soybean meal. When the beef cattle fattening concentrate supplement is prepared, sorghum and wheat replace corn energy feed in full dose, and corn distiller dried grains DDGS is used for replacing soybean meal protein feed in full dose. The beef cattle fattening concentrate supplement disclosed by the invention solves the problem that corn and soybean meal typical concentrate supplements are commonly adopted for fattening the beef cattle in China, fattening and meat-producing performance of the beefcattle are effectively improved, and the cost of concentrate supplement consumed by the fattening and meat producing processes of the beef cattle is greatly reduced. According to the preparation method, the beef cattle fattening concentrate supplement according with practical production is prepared more scientifically and reasonably, feed utilization efficiency is improved, the fatting and meat-producing performance of the beef cattle is improved, the breeding cost of the beef cattle is reduced, and the current blank in China that the beef cattle fattening concentrate supplement does not adoptany corn or soybean meal is filled up.