Trajectory accuracy is an important performance indicator for precision turntables. To improve the motion accuracy, this study improves the traditional control algorithm from the perspective of trajectory planning and motion control. For trajectory planning, the S-curve trajectory planning equations are deduced, and the trajectory planning parameter values are given in combination with the dynamic constraints of the turntable. This provides the motion control algorithm with trajectory commands that meet the dynamic requirements. For motion control, on the basis of traditional double closed-loop feedback control, DOB disturbance compensation and feedforward compensation are added to improve the servo performance and motion accuracy of the turntable. After describing the design process of the trajectory planning and motion control algorithms in detail, the two algorithms are integrated, and the specific implementation steps are provided. The performance tests of the multiple groups of algorithms are performed using the harmonic turntable and the RV turntable. The experimental results show that, compared with the traditional control methods, the proposed method can significantly improve the dynamic accuracy of the turntable, thus verifying the effectiveness of the algorithm in improving the motion accuracy.