Lithium-ion batteries have been widely used in various fields due to their high energy density, good cycle performance and low self-discharge. In recent years, the number of spent ternary lithium-ion batteries have increased dramatically. From the perspective of environmental protection and resource conservation, it is necessary to carry out green and efficient processes to recycle and regenerate spent lithium-ion batteries. This article reviews the research status of the recycling technology for spent ternary lithium-ion batteries, and point out recycling lithium-ion batteries should be in accordance of their characteristics and states. The hydrometallurgical processes including leaching and regeneration of cathode materials for spent lithium-ion batteries are introduced in detail, as well as the process of physical repair and regeneration of some spent cathode materials, and then their advantages and existing problems are illustrated. In the end, the prospect and development direction of the recycling of spent lithium-ion batteries are prospected.