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Aiming at the control synchronization problem of large multi-plate wave-making system in offshore Engineering laboratory, a new synchronous compensation method based on multi-PLC control structure is proposed . Firstly, using the real-time communication characteristics of EtherCAT Network, the delay between controllers is calculated accurately by network distribution clock. Second, the active compensation method is used to deal with the synchronization problem between multi-clock systems. This method combines the control structure characteristics of the wave-making system with the advantages of EtherCAT control network technology, and improves the synchronization performance of the whole system, and also increases the flexibility of the system, and satisfies the motion control requirements of the large artificial model wave making. Finally, the Controller experiment is designed to verify the proposed method, and the experimental results show that the proposed multi-controller synchronization method can effectively compensate the delay, the synchronization error of the system is less than 10us, and fully meet the technical requirements of the wave-making system.