Cinnamomum cassia essential oil has potential insecticidal and antibacterial activities. The addition of cinnamon essential oil to the diet has significant effects on poultry production performance, hypocholesterolemia, antioxidant activity, immunity and microecological balance of intestinal flora. The article reviews the research on the chemical composition of cinnamon essential oil and its clinical application in poultry, so as to provide reference for the research of cinnamon essential oil as feed additive in animal husbandry production. [ABSTRACT FROM AUTHOR]