Ambon banana stem are known to contain chemical compounds including flavonoids, saponins, and tannins. One of these chemical compounds has the potential as an antioxidant, namely flavonoids which has antioxidant properties as free radical scavengers. Antioxidants can be used to repair skin cells damaged by free radicals, these antioxidants can provide a moisturizing and brightening effect on the skin so that the skin is not only kept moist and looks radiant. The purpose of this study was to formulate sheet mask preparation from ethanol extract of Ambon banana stem (Musa paradisiaca var. sapientum (L)) into various concentration 5%, 7% and 9%. The sheet mask was then being examined for its activity to provide smoother skin after 4 weeks of treatment by measuring skin moisture content. Data was then being analyzed using ANOVA method. The research showed that sheet mask preparation of Ambon banana stem ethanol extract met the requirements for organoleptic evaluation, homogeneity, pH, irritation test. In increasing moisture content of Ambon banana stem ethanol extract sheet mask preparation, showed insignificant value (p > 0.05) where there is no significant difference toward the positive control. These results conclude that the sheet mask preparation of Ambon banana stem ethanol extract provides a moisturizing effect on skin.
 Keywords: Ambon banana stem, moisturizer, sheet mask