Abstract: This paper introduces the latest developments in high-speed machine tools. Several key technologies of ultra-high-speed machine tools—high-speed spindle units, high-speed spindle bearings, linear motor feed drive systems, high-speed machine tool control systems, and high-speed machining tools—are discussed. The development of ultra-high-speed machine tool technology in China is also discussed. Keywords: High-speed machine tool, high-speed spindle, linear motor, high-speed tool. Ultra-high-speed machining refers to cutting processes performed at speeds five to ten times higher than conventional cutting speeds. For example, in the laboratory, aluminum alloy machining has reached 6,000 m/s, while in actual production, it has reached 1,500–5,500 m/s. In the laboratory, the grinding speed of a single-layer coated wheel reaches 300 m/s, and grinding speeds of 500 m/s are currently being explored; while in actual production, it has reached 250 m/s. Ultra-high-speed machining can not only significantly improve the machining efficiency of parts, shorten machining time, and reduce machining costs, but also enable parts to achieve higher levels of surface finish and machining accuracy. High-speed machine tool spindle machining unit The high-speed spindle unit is the most critical component of high-speed and ultra-high-speed machine tools. Its main type is the electric spindle. Abroad, electric spindles equipped with various advanced electrical drive and control technologies have achieved specialized production and commercial supply, such as the electric spindles produced by Fisher in Switzerland. [b][align=center]For more details, please click: New Developments in High-Speed ​​Machine Tools and Key Technologies[/align][/b]