The invention discloses a reserved project optimization method based on contribution degrees of power grid effects. The method comprises the steps of S1, comprehensively collecting power grid reservedproject quantitative evaluation related data information, and establishing a reserved project evaluation index system based on the power grid effects; S2, according to the evaluation index system inthe step S1, analyzing and obtaining a quantitative calculation method for indexes; S3, performing calculation according to the evaluation index system and the quantitative method in the previous step, and by applying a principle of combining subjective and objective weights, determining a weight calculation method for the indexes in comprehensive contribution degree calculation; S4, according toa weight calculation formula in the step S3, carrying out single target optimization by adopting a particle swarm algorithm, and determining optimal weights; S5, according to the optimal weights in the step S4, calculating comprehensive contribution degrees of reserved projects, and carrying out dynamic sorting on the reserved projects by considering the influence on other reserved projects aftercompletion of the reserved projects in combination with the investment of the reserved projects, thereby completing the optimization of the reserved projects.