Docosahexaenoic acid (DHA) can effectively maintain the normal development of the brain and optic nerve and has the effects of protecting cardiovascular， anti-cancer and anti-inflammation. The heavy metals in algae oil are less. Therefore， compared with fish oil， DHA derived from algae oil is safer to be used as a dietary nutritional supplement. However， the DHA products of algae oil have the problems of low stability， poor oxidation resistance and the like. At present， the development of a steady-state delivery system of algae oil DHA has attracted extensive attention and many studies have been carried out. Among them， the emulsion delivery system has been proven to be effective in improving the stability and oxidation resistance of the emulsion. Therefore， in this paper， the common emulsion-based delivery systems of algae oil DHA and their delivery mechanisms were reviewed， with emphasis on the summary and discussion of the biopolymer-based algae oil DHA emulsion delivery systems and their applications in recent years， and the prospect for the construction of new emulsion delivery systems with antioxidant and other multifunctional algae oil DHA was prospected， to provide a theoretical reference for the stabilization of functional food components and the rational design of nutrition delivery systems.