With the development of unconventional oil and gas resources，secondary and tertiary oil recovery technologies for enhanced oil recovery in unconventional reservoirs have attracted widespread attention from scholars. Foam flooding has achieved good results in the development of medium and high water-cut oil reservoirs due to its unique properties of plugging water instead of oil，and foam stability is a key factor affecting the effect of enhanced oil recovery. In recent years，technologies such as polymer-enhanced foam and nano-particle foam stabilization have become the research focuses for scholars both in China and abroad. However，these enhanced foam technologies still have problems such as large foam diameters，great difficulty in removing adhesive polymers in reservoirs，and high technical costs，which limit the promotion and use of these technologies in low-permeability reservoirs. Compared with ordinary foams，micro-foams have the characteristics of small diameters（10-100 μm），large specific surface areas，high stability，and water-like fluidity. As a potential tertiary oil recovery technology，micro-foam flooding has the advantages of low injection pressure and wider coverage. Moreover，its injection pressure is only a third of the injection pressure of the ordinary foams，at the same time，it can effectively control its gas fluidity，expand the swept volume，and enhance oil recovery. On the basis of literature research，this paper introduced the structure and properties of micro-foams and the principle of micro-foam plugging and enhanced oil recovery，and the current research status of the micro-foam flooding technology for enhanced oil recovery is summarized. Finally，this paper indicated the problems of micro-foams in the development of low-permeability reservoirs and forecasted the development potential of micro-foams in the application of enhanced oil recovery.