The invention relates to a thermal-mechanical coupling edge grinding technology applicable to manufacturing diamond tools. The thermal-mechanical coupling edge grinding technology can solve the problem that the existing mechanical edge grinding technology of the diamond tools can not lead the sharpness of cutting edges of the diamond tools to be better than 10nm. The method comprises the following steps of: regulating an edge grinding machine tool of the diamond tools to be balanced; carrying out thermal treatment after carrying out fine-turning forming on a working surface of a steel grinding disc, and carrying out fine polishing to achieve the mirror effect; carrying out fine dynamic balancing on a main shaft system of the grinding machine tool; clamping the diamond tool and regulating a clamp of a tool body to be horizontal; opening a gas source, turning on a power supply of the edge grinding machine tool of the diamond tools and regulating the revolution speed of a main shaft of the machine tool; adjusting the edge grinding direction of a front tool face to be easy to grind and regulating a front angle of the tool; and carrying out edge grinding on the tool under the conditions that the grinding speed is 33.96m/s, the grinding pressure is 5.95N and the grinding time is 5min. The technology is characterized by simple edge grinding technology, low cost and high efficiency and can prepare the diamond tools with the sharpness of the cutting edges of being better than 10nm by edge grinding.