Oil-in-water type nanometer emulsion elecampane oil and litsea citrata oil and the method for preparing the same

The invention discloses an oil-in-water type nanometer emulsion having alantol and litsea cubeba oil, and a method for preparing the same. The invention comprises a surfactant of 15-30%, an oil phase of 2-15%, the alantol of 0.05-25%, the litsea cubeba oil of 0.05-25%, and distilled water of residuary. The oil-in-water alantol and litsea cubeba oil nanometer emulsion is yellow or achromatic transparency liquid in appearance, with diameter distribution of the liquid droplet of 1-30nm, and fine stability; can increase medicine stability of the alantol and litsea cubeba oil in the preparing process, improve solubility and bioavailability, defer the medicine metabolism time within a human body, reduce quantity of accessories and production cost, thus has abroad market prospect in medical art.