The invention discloses a natural runoff series consistency correction method. The method comprises the following five parts: I, checking natural runoff volume and checking time sequence mutability; II, analyzing rainfall-runoff relationship; iII, carrying out natural runoff series consistency correction based on a statistical method; iV, correcting the consistency of the natural runoff series based on a graphical method; and V, correcting the natural runoff series consistency of the comprehensive statistical method and the graphical method. According to the method, a mapping conversion moduleis designed, and the application range of a statistical correction method suitable for a threshold judgment method is standardized; graph analysis and statistical analysis are integrated, a graph analysis result serves as a controllable outer boundary condition, the problems that the correction proportion exceeds 100%, and the relative size relation of the natural runoff volume in abundance and withered years after correction is disordered are effectively solved, and a natural runoff consistency correction method system is enriched.