The invention relates to a new energy power station power generation plan making method and system. The method comprises the steps of determining peak load regulation and power limitation power of a power grid according to power generation power after section limitation of each regional power grid in the power grid; and determining planned power generation power of each new energy power station inthe power grid according to the peak regulation and power limitation power of the power grid. According to the technical scheme provided by the invention, the method comprehensively considers the predicted power generation capacity and non-nested section equal-proportion power limitation of the new energy power station, and ensures the consistency of the power limitation rate of each power station and the fairness of power generation plan making; the difficulty and the workload of manual adjustment are reduced under the condition that the limited sections of the power grid are excessive or part of the sections are seriously limited; meanwhile, when the power generation plan of the new energy power station is adjusted, a complex equation set does not need to be constructed, the calculationdifficulty is reduced, and the adjustment time is shortened.