The invention discloses a feed additive capable of preventing and treating avian influenza, with an active probiotic culture medium containing traditional Chinese medicines. The active probiotic culture medium containing traditional Chinese medicines is used for fermenting and culturing microorganisms used in a microecology feed additive for poultry, and comprises the following components of wheatbran, corn flour, brown sugar, traditional Chinese medicine components, light calcium carbonate and yeast cream. The traditional Chinese medicine components comprise radix codonopsis, astragalus membranaceus, Chinese magnoliavine fruits, radix acanthopanacis senticosi, radix scutellariae, Chinese pulsatilla roots, honeysuckle flowers, andrographis paniculata, rhizoma coptidis, radix rumex patientia, pollen and radix bupleuri. The feed additive can solve the problems that in the prior art, the number of the microorganisms in the microecology feed additive for poultry is small, the activity islow, and the colonization capacity in intestinal tracts is weak, so that the number of the microorganisms in the microecology feed additive for poultry can be increased, the activity of the microorganisms and the colonization capacity in the intestinal tracts are improved, and further the avian influenza is effectively prevented and treated.