Countercurrent extraction with extreme phase ratio widely exists in many fields. However, it remains a great challenge for its low efficiency because of poor dispersion, unstable two-phase flow and high mass transfer resistance. It is well known that the liquid-liquid microdisperion technologies have provided very high promising capacities in many fields, especially in the liquid-liquid extraction processes due to microscale droplets and high mass transfer interfacial area. But they are also facing some challenges for their applications in complex conditions, such as high viscosity, high phase or high mixing ratio. New liquid-liquid microdispersion techniques and microdroplet-based continuous countercurrent extraction technologies with high phase ratio are highly required. This presentation will show some new developments in liquid-liquid microdisperion for microdroplet generation. The shear forces used for multiphase flow dispersion and enhanced mass transfer in traditional passive microreactors depend on the continuous phase flow rate, leading to significant limitations in their applications. We propose the introduction of a rotating flow field in microscale spaces, designing a novel active device—the miniaturized annular rotating device (m-ARD). The m-ARD utilizes a rotating flow field to provide shear forces instead of relying on continuous phase flow rates, achieving efficient mass transfer and separation under high viscosity or large liquid-liquid volume ratio conditions. Meanwhile, we develop a novel intensification technology via integrating the annual rotating flow with micro-capillary jetting dispersion. The phase whose volume flow rate is much smaller is ejected into the continuous phase by micro-capillary jetting to form microdroplets. The annular rotating field is introduced to stabilize the flow and reduce the extraction resistance. The microdispersion, two-phase countercurrent flow, and extraction characteristics are systematically studied. The results show that three theoretical stages in 60 cm with an operation capacity of 43.6 m3/(m2·h) are successfully achieved when the phase ratio exceeds 50. In this presentation, a countercurrent extraction apparatus containing a cross-flow T-junction microdisperser and a milli-scale column will be introduced. The experimental results show that the overall mass transfer coefficient KLa could range from 0.087 to 0.352 s-1, and the theoretical stage could reach up to 2 with only 0.25 m height of the column, which shows higher mass transfer efficiency compared to the traditional devices. The mechanism of mass transfer enhancement will be discussed. This new technology may become a general way for extraction intensification with the extreme phase ratio.