The invention relates to an electro-hydraulic servo heavy load parallel connection platform control system for a nuclear fusion device, which comprises a main controller, wherein the input end of the main controller is respectively connected with the output ends of a posture measurement system and the sensor feedback unit of a hydraulic system, the output and input ends of the main controllers are respectively connected with the input ends of a valve set control unit and a hydraulic station control unit, the output end and the input end of the main controller are in communication with an upper computer through a wireless communication module, and the input and the output ends are connected with an output end of a man-machine interaction device. The invention further discloses a control method of the electro-hydraulic servo heavy load parallel connection platform control system for the nuclear fusion device. According to the method provided by the invention, the control accuracy and the operating performance of a platform are improved, meanwhile double-stage self locking is achieved, pressure keeping and self locking for a long time can be achieved under a heavy load, and the safety and the reliability of the system are improved; intelligent operating level of a heavy load parallel connection platform can be achieved, high pressure, small flow and high accuracy pressure control can be met during fine turning on a parallel mechanism, and high accuracy operation and high self-locking performance in butting between a component transport truck and a carriage window under nuclear fusion environment can be met.