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In order to make solar panels absorb sunlight better, a design of solar panel automatic chasing system based on GPS positioning is proposed. By using the GPS positioning function to provide accurate latitude and longitude and time for the position of the tracking device, calculating the elevation angle and azimuth of the current time sun by the visual trajectory method, and obtaining the elevation angle and rotation of the current solar panel rotation by using the height/orientation sensor Angle, the current tracking deviation value is calculated according to the intermittent tracking method, and the corresponding electrical pulse signal is output through the main controller. The solar panel is driven by a tracking device that controls the stepper motor. In summary, by implementing the main parameters including geographic location and timing, tracking deviation and the position of the sun, it is possible to accurately improve the high-precision automatic tracking of sunlight, and also increase the stability of the solar panel automatic chasing system, and More practical.