In order to improve the synchronous accuracy of eccentric load starting and sudden load driving of agricultural machinery, a load-sensing shunt synchronous drive system for agricultural machinery was proposed.The system has the advantages of a load-sensing system and shunt valve simultaneously.The principles of hydraulic working,the pressure compensation,and the shunt of the system were analyzed.The system was modeled and simulated,and the synchronization and robustness of the system were analyzed.The simulation results show that the system has the advantages of fast response speed and high synchronization accuracy; at the eccentric load starting,whether the multi-way valve is complete or half open,the hydraulic motor can reach a stable speed within 0.9 s,and the synchronization error is less than 2 r/min after stability; when the load changes suddenly,the system can reach the stable target speed within 0.7 s and have good robustness.The system can adapt to the conditions of eccentric load start and sudden load change of agricultural machinery and meet the requirements of high straight-line driving and high accuracy of modern agricultural machinery in the driving process.