Feed additive for improving daily ration effect of laying hens as well as preparation method and application of feed additive

The invention relates to the technical field of feed additives, and particularly discloses a feed additive for improving the daily ration effect of laying hens as well as a preparation method and application of the feed additive. The feed additive comprises the following raw materials in parts by weight: 8-25 parts of a herba epimedii extract, 5-15 parts of compound amino acid, 10-30 parts of a compound traditional Chinese medicine additive and 8-16 parts of an asparagus straw extract, the preparation method comprises the following steps: uniformly mixing methionine, lysine, histidine, isoleucine and tryptophan to obtain compound amino acid; uniformly mixing hawthorn, semen cuscutae, motherwort, bighead atractylodes rhizome and astragalus membranaceus, crushing and sieving to obtain a compound traditional Chinese medicine additive; uniformly mixing the herba epimedii extract, the compound amino acid, the compound traditional Chinese medicine additive and the asparagus straw extract to obtain the feed additive