To control the location and direction of simulated sunlight, a control system for moving solar simulator is designed and tested. The digital input and output card + driver structure is used in the system. It’s controlled by computer through programming to control the status of xenon lamp power, speed and direction of the step motor. And remote control is completed based on UDP protocol. The experiment results show that the control system is reliable, and the accuracy of translational motion and vertical motion is better than 0.3 mm, the accuracy of azimuth motion and pitch motion is better than 5′, which can meet the anticipative requirements of solar simulator experiment system.