Chemical absorption is one of the most promising technologies for post-combustion CO2 capture. But the high energy consumption of solvent regeneration process will limit its further development. The liquid-liquid biphasic solvents have been widely concerned by researchers due to the potential of reducing the energy consumption of CO2 desorption process. This paper gives an overview of the development of liquid-liquid biphasic solvents. According to the solvents composition and the phase separation mechanism

the liquid-liquid biphasic solvents are divided into thermomorphic biphasic solvents

organic amine-low absorption rate amine solvents

chemical-physical solvents

and organic amine-ionic liquid solvents. The research progress of various solvents is introduced

including the absorption performance and the phase separation mechanism. The advantages and disadvantages of the solvents are analyzed. It can be concluded that liquid-liquid biphasic solvents have great potential for energy saving. The future research should focus on the design principle and the deep phase separation mechanism of liquid-liquid biphasic solvents.