Wax emulsion is a kind of multi-phase emulsion in which natural wax and synthetic wax are dispersed in water under the action of emulsifier. The preparation method is mainly emulsification by phase conversion. The wax with low melting point can give the leather surface a waxy feeling, moderately close the grain injury, but also improve the skin accumulation, prevent the sticking plate when ironing or embossing. Wax emulsion with high melting point can give high gloss, polishing, excellent transparency, and can be used for aniline coating. Wax emulsion has the characteristics of anti-slip and can be used in waterborne ink, waterborne industrial paint, waterborne glossy oil leather finishing agent, metal die casting release agent and so on.