Cow feed additive

The invention discloses a cow feed additive. The cow feed additive comprises a fermentation preparation prepared by mixing a plurality of Chinese herbal medicines, wherein the Chinese herbal medicinescomprise 35 parts by weight of herba cistanche, 25 parts by weight of radix morindae officinalis, 25 parts by weight of semen cuscutae, 25 parts by weight of herba epimedii, 20 parts by weight of rhizoma cyperi, 20 parts by weight of actinolite, 25 parts by weight of radix angelicae sinensis, 35 parts by weight of herba leonuri and 20 parts by weight of radix glycyrrhizae; and the fermentation preparation is prepared by mixing and fermenting the Chinese herbal medicines through bacillus subtilis and saccharomycetes. The cow feed additive has the beneficial effects that the herba cistanche, the radix morindae officinalis, the semen cuscutae, the herba epimedii, the rhizoma cyperi, the actinolite, the radix angelicae sinensis, the herba leonuri and the radix glycyrrhizae are adopted, and the bacillus subtilis and t