The invention provides a solar energy powered fan dynamic control system, which comprises a solar panel, a collection circuit, a controller, a DC/DC conversion circuit and a fan group. The output endof the solar panel is connected with the input end of the DC/DC conversion circuit, and the output end of the DC/DC conversion circuit is connected with the fan group. The collecting end of the collecting circuit is connected with the output end of the solar panel, and is used for collecting the output voltage and the output current of the solar panel. The input end of the controller is connectedwith the output end of the acquisition circuit, and the first output end of the controller is connected with the control end of the DC/DC conversion circuit. The controller is used for acquiring the output voltage and the output current of the solar panel, and adjusting the output of the DC/DC conversion circuit according to the output voltage and the output current of the solar panel. The systemcan fundamentally reduce the indoor temperature of the top floor, utilize the energy converted by the solar panel to supply power for the fan group, not only can realize the heat dissipation to the specific place, but also does not need to consume additional electric energy, not only are energy-saving and environmental protection effects are achieved, but also the cost is low.