In order to explore the antioxidant activity of plantain grown in northwestern Yunnan,this study used DPPH free radical scavenging rate method,ABTS free radical scavenging rate method and FRAP total reducing ability method to evaluate the antioxidant activity of its petroleum ether extract,ethyl acetate extract,95% ethanol extract and water extract.The results show that the four extracts all have certain antioxidant activity.Among them,95% ethanol extract has the best scavenging effect on DPPH and ABTS free radicals (IC₅₀ is 116.00 mg/L and 25.00 mg/L which was 1.2% and 5% of Vc),and the total reduction ability of water extract is the strongest (when the concentration is 1.00 g/L,the FRAP value is 3.42±0.02).Studies have shown that the plantain grown in northwestern Yunnan has in vitro antioxidant activity,and is higher than that grown in other areas.Further research is needed to confirm its antioxidant mechanism and provide a theoretical basis for the development of natural antioxidant grown in northwestern Yunnan.