Abstract: Titanium alloys are typical difficult-to-machine materials due to their characteristics such as low thermal conductivity and high chemical activity, which leads to difficulties in cutting and low efficiency. External field-assisted technology provides a new solution for improving difficult-to-machine materials by introducing physical fields such as laser, ultrasonic vibration, and magnetic field to improve the tool-workpiece interaction during the cutting process, which significantly improves the machining efficiency and surface quality, and extends the tool life. In recent years, scholars in China and foreign countries have introduced the external field-assisted cutting technology into the cutting process of titanium alloys to improve the machining accuracy and machining efficiency of titanium alloys. The current research status of the application of external field-assisted cutting technologies in the machining of titanium alloys was introduced, and the machining mode of different external field-assisted cutting machining technologies, the material removal mechanism and its effect on the microstructure of the workpiece were analyzed. Compared with traditional cutting, the use of external field-assisted cutting technology can improve the surface quality of the workpiece and increase tool life. The multiple external field-assisted cutting technologies combine the advantages of different physical fields to produce a synergistic effect, which is an important direction for future development, which shows great potential in improving the cutting performance of difficult-to-machine materials such as titanium alloys.