To provide a guava leaf extract powder which exhibits less deterioration in quality and functions after storage of the solution thereof for a long period of time. The invention provides a method for producing a guava leaf extract powder, including extracting guava leaves with hot water at 90 to 98.degree. C.; concentrating the obtained extract to a Brix level of 20 to 30; and lyophilizing the concentrated extract, and a guava leaf extract powder produced through the method.