Supercritical water processing control system and control method thereof

The invention relates to a supercritical water processing control system and a control method thereof. The supercritical water processing control system provided by the invention comprises a control unit, an analog signal acquisition unit, a digital signal acquisition unit and a field execution device, wherein the control unit is the control core of the system; the input end of the control unit is accessed to the field signals of the analog signal acquisition unit and the digital signal acquisition unit; the output end of the control unit is connected with the field execution device; the control unit is singly operated and automatically switched through the form configuration of redundancy pairs; and the control unit is in communication connection with an upper machine through Ethernet. The method provided by the invention comprises the starting course and stopping course of the supercritical water processing control system, the overvoltage protection course at the top of a reactor and the over-temperature pr