Alpinia katsumadai essential oil microemulsion and preparation method thereof

The invention provides an alpinia katsumadai essential oil microemulsion and a preparation method thereof, and the preparation method comprises the following steps: (1) mixing sorbitan fatty acid ester and absolute ethyl alcohol to obtain a mixed surfactant A; tween 80 and absolute ethyl alcohol are mixed, and a mixed surfactant B is obtained; (2) oscillating and stirring the alpinia katsumadai essential oil while dropwise adding a surfactant A to obtain a primary alpinia katsumadai essential oil mixed oil phase; (3) dropwise adding a mixed surfactant B while shaking and stirring, and adding a mixed aqueous solution of hydrochloric acid and sodium chloride to obtain a katsumadai seed essential oil mixed oil phase; (4) adding water into the alpinia katsumadai essential oil mixed oil phase in a stirring state, mixing, and shearing at a high speed until the alpinia katsumadai essential oil mixed oil phase is clear or semitransparent to obtain the alpinia katsumadai essential oil micro-emulsion, the prepared alpi