As a key core basic component of many high-end equipment, the lubrication performance of the dynamic pressure oil film worm gear pair directly affects the performance of these high-end equipment. This article proposes an accurate modeling method for dynamic pressure oil film worm gear pair and the accurate three-dimensional digital model is established; And for its lubrication performance, conducts a thermal elastohydrodynamic lubrication analysis. Based on the theory of elastohydrodynamic lubrication, a mathematical model of thermal elastohydrodynamic lubrication for the dynamic pressure oil film worm gear pair is established. The multi-grid method is used to solve the distribution status of oil film thicknesses and oil film pressures near the contact line at different times during the meshing process. The variation of oil film thicknesses and oil film pressures from mesh-in to mesh-out and from the root to the tip of the worm gear teeth is analyzed to predict the lubrication performance of the dynamic pressure oil film worm gear pair. This provides a basis for subsequent optimization of lubrication performance, thereby improving the service life and performance of high-end equipment in China, and is of great significance for the high-performance development of high-end equipment in China.