The invention relates to a feed additive for improving the energy intake level of beef cattle after delivery, and aims to solve the current problems of abnormal rumen fermentation, low crude fiber digestibility and easy ruminal acidosis when the energy intake level of the beef cattle after delivery is improved by greatly increasing the concentrate feed ratio in a daily ration. The feed additive is prepared from astragalus, pilose asiabell root, licorice, uniflower swisscentaury root, Chinese angelica, leonurus, acorn kernel meal, dried orange peels, mint, dandelion, parslane herb and shizandra berry which are dried, crushed and screened. The feed additive is added into a concentrated feed of the beef cattle after delivery and can be directly fed. The feed additive can improve the crude fiber digestibility while improving the energy intake level, does not influence the rumen fermentation, avoids the happening of the ruminal acidosis, and has the characteristics of convenient operation,high safety, easily available sources, low cost and the like.