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The existing hysteretic dynamic automatic control system of vibration isolator based on PLC has the shortcoming of high control error, so an automatic control system based on dynamic matrix control algorithm is designed. The hardware part of the system is composed of dynamic control center, servo motor, power sensor, preamplifier and data calculation unit. In order to improve the control performance of the system, a type of MCU controller is built in the servo motor module to ensure the stable output of electromagnetic control signals. Based on the principle of dynamic matrix control algorithm, an automatic control system is designed. The main control program of the system and the basic flow chart of dynamic predictive matrix control are given. The model of dynamic rolling prediction is used to reduce the error in the control time domain and ensure the stable output of hysteretic dynamic value. The analysis data show that the proposed automatic control system can meet the needs of batch and remote testing in terms of functionality, and the system errors under three steady-state conditions are all satisfied. It is obviously lower than the traditional automatic control system, and the highest error output is less than0.05.