Abstract: Grinding temperature has an important influence on the high-speed grinding performance of engineering ceramics. It is difficult to measure the high-speed grinding temperature of engineering ceramics by thermocouple method. The finite element simulation grinding temperature can easily analyze the high-speed grinding temperature of engineering ceramics, but the error of engineering ceramics finite element simulation grinding temperature is large due to the low accuracy of engineering ceramics grinding thermal partition ratio. Therefore, on the basis of a small number of engineering ceramics high-speed grinding temperature measurement experiments by using thermocouple method, the current calculation formula of thermal partition ratio of engineering ceramics grinding workpiece is modified by using least square linear regression, and a high-precision formula of thermal partition ratio of engineering ceramics high-speed grinding workpiece is obtained. On this basis, the error between the high-speed grinding temperature simulated by the finite element method and the grinding temperature measured by the experiment is controlled within 8.9%, which significantly improves the accuracy of the high-speed grinding temperature simulated by the finite element method.