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In the field of ocean engineering,the array type wave maker is often used to simulate large scale ocean waves in the lab for the performance test of the designed marine structures. The motion control technology of Baumueller PLC is studied for improving the synchronization control performance of the snake type wave maker,and a synchronous motion control solution with multistage master-slave structure is proposed to realize synchronous control of all wave unit strictly. For the problem of large amount of data and slow transmission speed between IPC and PLCs,a lossless data compression and a linear data interpolation technology are used to cut down the generated wave data size,and a multi-threaded Ethernet communication method is adopted to increase the data transmission speed. Moreover,for the large mechanical inertia and load of the system,overcurrent phenomenon of motors may happen during the its starting and stopping process. Therefore,a cosine fitting algorithm is proposed to optimize it. In experiments,the system went stably with high data transmission speed and precise synchronous performance,which can fully meet requirements of large scale ocean wave simulation.