The global development history of ESR technology can generally be divided into three distinct stages. The first stage spans from 1935 to 1959, representing the initial phase of ESR technology. During this period, progress was relatively slow due to the monopoly of related enterprises and limited technological dissemination. The second stage, from 1960 to 1980, marks a period of rapid development. During this time, the number and production capacity of ESR furnaces worldwide increased significantly, the range of products expanded continuously, and process technologies gradually matured. The third stage extends from 1980 to the present. As several key challenges in traditional ESR—such as low production efficiency, high energy consumption, fluorine pollution, gas absorption during the process, and severe segregation in large ingots—have not been adequately resolved, and with the continuous advancement of economy and society, demands for material quality have continued to rise. Consequently, ESR researchers have persisted in innovating upon the foundation of conventional ESR technology, leading to the development of numerous novel ESR techniques. These advancements have propelled the industry into a new phase characterized by diversified processes, improved product quality, and automated control.