Aiming at the problems of weak torque and high failure rate of single-motor steer-by-wire system in commercial new energy vehicles,a synchronous steering angle control strategy of double-motor steer-by-wire system for new energy vehicles was proposed.Based on the master-slave control mode,a sliding mode controller with disturbance observer was introduced,to make the system with strong robustness under the condition of model uncertainty and external disturbance,then the dynamic response and synchronization performance were also improved accordingly.Finally,the verification was completed with the help of the physical platform.The experimental results show that when the master-slave control is applied,the average synchronization errors of the sine and trapezoid position trajectories are reduced by 83.7% and 70.4% respectively,while the maximum synchronization errors are reduced by 92.5% and 74.3% respectively.The steer-by-wire system has achieved good synchronous steering angle control performance.