Microemulsion (ME) is a transparent, isotropic and thermodynamically stable dispersion system that spontaneously forms without external energy. Because the aqueous phase and the mixed surfactant can be constructed with the oil phase contained in the vegetable oil to form a stable and amphiphilic microemulsion system, the microemulsion technology can be used to simultaneously extract the oil and the natural active ingredient from the vegetable oil, while achieving the purpose of simplicity, efficiency, innocuity and harmlessness. This review sum...