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In order to improve the photoelectric conversion efficiency of photovoltaic generation systems, commonly used the solar automatic tracking control system to maximize the system get more solar energy and Increase the conversion efficiency. A novel high-precision closed-loop angle control solar automatic tracking controller was designed and presented in this paper, which used intelligent fuzzy control algorithm, and used high-performance MCU as control core, to achieve precise track sun control. Then automatic efficiently track the sun to receive the maximum solar radiation and the highest photoelectric conversion efficiency. The experimental results are presented to confirm the feasibility and effectiveness of the designed controller.