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In view of the difficulties in the selection of step size and the problem of "miscarriage of justice", a variable step perturbation and observation control method based on power prediction is proposed. Firstly, the algorithm is used to determine the direction of the perturbation by the power prediction method, and then avoid the "miscarriage of justice". Then, the maximum power point is precisely positioned by the variable step perturbation observation method. The simulation model is based on the Matlab/Simulink platform. The algorithm not only has good dynamic performance in tracking the maximum power point, but also effectively improves the oscillation and "miscarriage" problem in the traditional disturbance observation method, which has positive significance to improve the utilization rate of solar energy.