The invention discloses a 
feed additive for increasing the egg yield of hens and a preparation method thereof. The 
feed additive is prepared by fermenting the following 
traditional Chinese medicine raw materials of radix 
codonopsis, poria cocos, bighead atractylodes 
rhizome, malt, medicated leaven, 
semen cuscutae, 
epimedium and common 
cnidium fruit with lactobacilli, bifidobacteria, microzyme and 
bacillus subtilis. For the 
feed additive for increasing the egg yield of the hens, disclosed by the invention, 
traditional Chinese medicine components are compounded with microorganisms to form a composite 
traditional Chinese medicine micro-ecological preparation to be used as the feed additive, so that the number of 
beneficial bacteria can be increased, the ecological balance of intestinal tracts of organisms can be maintained, the growth of harmful 
bacteria is restrained, and the health of the intestinal tracts of the organisms can be improved; 
macromolecular substances, such as starches and proteins, in the feed, can be effectively decomposed, small molecular 
nutrient substances which are easy to digest and absorb for laying hens are released, and the 
utilization rate of the feed is increased; the 
egg laying rate, the production performance and the reproductive performance are obviously improved, the quality of eggs is improved, and the peak period of 
egg laying is prolonged; and the toxic substance is decomposed in the 
fermentation process, and the feed additive dost not have 
medicine residue and is free of toxic and side effects, so that the feed additive is safe and reliable.