Solar maximum power point tracking method and device

The invention discloses a solar maximum power point tracking method and device. The method comprises the steps that the power Pt and the power Pt-1 of a light acceptor at the current position and the power Pt-1 of a light acceptor at the previous position are obtained respectively; according to the difference value between Pt and Pt-1, determining the rotation direction of the light receptor, and adjusting the position of the light receptor according to the step length; when the number of continuous rotation times of the light receptor reaches a first preset value, the step length is updated; and when the updated step length reaches a second preset value, determining the maximum power position of the solar energy. According to the method, the step length and the direction are preset, the light acceptor is driven to move, the change condition of the receiving power of the light acceptor in the moving process is detected, and then the moving direction and the step length are adjusted according to the change con