Directdriven CNC rotary table spindle is of great significance to improve processing efficiency and accuracy, improve product quality. The principle and structure of selfdeveloped MST210 directdriven CNC turret were analyzed and its highspeed milling model was established. Based on the knowledge of mechanical design, material mechanics and theoretical mechanics, the strength and stiffness of the three parts on the spindle were calculated and checked according to the different materials and forms of stress. The strength and stiffness of the three parts were calculated and checked by finite element analysis. The comparison between the theoretical analysis and the simulation results shows that the stress conformance reaches to 92% and the deformation conformance reaches to 857%. Therefore, the spindle of the turret can meet the requirements of strength and stiffness.