The present invention discloses an electric power system dynamic economic dispatching method for rapidly solving a considering a valve point effect. The object function section linearity of the dynamic economic dispatching of the considering valve point effect is performed to reasonably convert the dynamic economic dispatching problem of the considering valve point effect to a mixed integration linearity planning problem for solution to obtain an initial solution, the decoupling between the adjacent time section set output is performed based on the initial solution, the dynamic economic dispatching is converted to a static economic dispatching, and the static economic dispatching is optimized by employing a dimension speed drop algorithm to obtain the optimization result. The calculation amount is small, the calculation time is short, and the practicability is good.