Friction stir welding (FSW), as an advanced solid-state joining technology, has been widely applied in aerospace and other high-end manufacturing fields. However, the joining of high melting point alloys poses new challenges to the development of FSW. The auxiliary heat source-assisted FSW technique, which utilizes external energy fields, can effectively address the issues encountered during the FSW process of high melting point alloys. This method offers several advantages, including expanding the process window, enhancing mechanical properties, reducing the welding upsetting force, and reducing stir tool wear. This paper summarizes the research progress on various auxiliary heat source-assisted FSW techniques for high melting point alloys, including induction-assisted, laser-assisted, current-assisted, arc-assisted, and backside heating-assisted methods. Significant achievements have been made in these studies, such as increasing heat input, reducing the welding upsetting force, optimizing the microstructure, and improving the mechanical properties of the joints. Furthermore, the future research directions of auxiliary heat source-assisted FSW for high melting point alloys are proposed and discussed.