The invention provides a slightly charred feed for livestock and a preparation method thereof. The slightly charred feed comprises the following raw materials: the tail ends of sugarcane, cassava stems, cassava leaves, corn, soybean meal, molasses and a mixed bacterial strain. According to the invention, through slight charring of the surface of a feed, the nutrient digestion rate of the feed can be increased, and the feed has improved palatability and can be more easily absorbed by animals; the slightly charred feed can adsorb more nutrients and prolong the retention time of the nutrients in the rumens and small intestines of animals in the process of rumination, so waste in the process of rumination is avoided, and nutrient absorption of the small intestines is improved; and after slight charring, slightly charred components of the feed can improve the structure and activity of microfloras in the stomachs of animals.