Green pig fattening feed Chinese herbal medicine additive and preparation method thereof

The invention relates to a green pig fattening feed Chinese herbal medicine additive containing Houttuynia cordata, herba lycopi, barley, sweet wormwood, seaweed, Coptis chinensis, Astragalus mongholicus, common andrographis Herb, verbena, medlar, Angelica sinensis, folium artemisiae argyi, Cyrtomium fortune and ageratum. The Chinese herbal medicines are aired, crushed and sieved by 40-60 meshes and evenly stirred to obtain the green pig fattening feed Chinese herbal medicine additive. When in use, 1-2wt% of the additive is added to a basal feed for lard pigs; the basal feed is fed to the lard pigs for 2-3 times per day; dry feeding or slop feeding can be adopted. The pigs eating the additive have extremely low incidence rate and death rate and high crop rate. Through multiple experiments, pestilence can be prevented from happening; and the grown fresh pork does not contain the residuals of antibiotic or hormone or other chemicals. The invention can be used for large, medium and little pigs and for farmers to