The invention provides a poultry feed additive and poultry feed. The poultry feed comprises energy feed, protein feed, an amino acid additive, trace elements, a vitamin additive, phytase, salt, baking soda, an inorganic carrier and the poultry feed additive, wherein the poultry feed additive comprises a yucca extract, cinnamic aldehyde, chilli oil and cecropin. Compared with existing feed, the poultry feed is added with the poultry feed additive, wherein the yucca extract can be used for reducing the ammonia concentration and stink in a breeding environment, restraining the breeding of harmful bacteria, increasing the number of effective microbial communities, sustaining the healthy environment of poultry intestinal tracts, improving the utilization rate of nutrient substances, and improving the immunity of organisms; the cinnamic aldehyde and the chilli oil can be used for promoting the growth of poultry, reducing the feed conversion ratio, also reducing the incidence of intestinal diseases, and increasing the feed intake; the cecropin has the effects of sterilization, antivirus and relief of immunosuppression, and can be used for promoting the intestinal health, improving the immunity of the organisms, and reducing the incidence of diseases.