An automatic solar tracking control system is designed to improve the photovoltaic conversion efficiency of solar panel.The device will detect the sunlight direction through light tracking circuit,and send the deviation signal to single chip microcomputer (SCM) through A/D conversion circuit,then the SCM will produce a corresponding adjustment signal to drive the machine to follow the track of the sun.Being simple in structure,cheap in cost and reliable in tracking precision,this control system can be applied to solar power system to increase solar energy utilization efficiency.