In order to meet the performance requirements of the solar power supply system for stable output power, high solar conversion rate, low cost, miniaturization and easy deployment, a small-scale solar power supply system with track the sun using Kalman filtering algorithm and MPPT technology is proposed. The design adopts photoelectric method to track the position of the sun. The control process is modeled and simulated in SIMULINK. It is designed to add a Kalman filter to the output of the classic PID control to make the system achieve the best control effect. The MPPT control circuit is added to the power output end to make the solar panel in the maximum power output state. The experimental results show that the system has high solar energy utilization, good power output effect, and high practical application value.