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In order to solve the present situation of low accuracy of artificial joint closure in segmented shipbuilding mode, put forward a multi machine synchronous control method of three-dimensional adjustment machine, design the synchronization control scheme based on Siemens S7-200 PLC and industrial wireless Ethernet. In the scheme of synchronization control system, read and calculation condition data by using PLC, and the calculation results were transferred into the dimensions of the cylinder displacement value, while the cylinder built-in displacement sensor will be the result of the action of feedback to the PLC closed-loop control, so as to ensure the accuracy of synchronous control. Using industrial wireless Ethernet as the transmission medium of data, the operator can change the position flexibly, which is convenient and practical. In the experiment, a system composed of 4 machines, respectively X, Y, Z of cylinder three directions were tested, the results show that the system can be stably moving, lifting action, the same direction of the cylinder synchronization error of each machine meets design requirements in the action process, achieved synchronous control effect.