Abstract: A monitorng system for 1 200 kV high-power microwave source driver is designed for automatic control requirements. In the system， a high-power voltage regulator produces continuous adjustable voltage with a multifunction DAQ card， which is transformed into direct current high voltage by high voltage epoxy transformer and silicon diodes and so on. A high-speed I/O card makes the trigger system work according to timing. The master computer can accomplish real-time monitoring of DC high voltage，thyratron anode voltage， ground current and other devices in the driver via serial interface of RS-485， and the central host computer communicates with the control computer via Ethernet. The driver can work individually or harmonically with the central computer. LabVIEW is adopted as the development tool of the software system. Moreover， in order to decrease the influences of high voltage and intense current produced in high pulsed power experiments on operational site， reliability design is blent in the system hardware and software. The experimental results show that the system is an easily-manipulated， real-time system with user-friendly interface， performing reliably， and stably by rule and line， and it has good expansibility and portability in intelligent control for high-power microwave source driver.