The invention discloses a DC transmitting end transient overvoltage calculation method considering a dynamic process of a control system, and the method comprises the steps: firstly, calculating firstreactive power consumed by a converter station according to system operation parameters and a DC closed-loop transfer function; secondly, calculating a transient voltage change rate according to thefirst reactive power and the second reactive power of an AC side; and finally, iterating the transient voltage change rate to obtain a transient overvoltage value. According to the technical scheme provided by the embodiment of the invention, the transient overvoltage value is determined according to the system operation parameters and the closed-loop transfer function of the DC line; the closed-loop transfer function of the DC line can determine the dynamic process of control parameter change caused by the regulation and control effect of the control system after the fault occurs, and then the transient overvoltage voltage is determined. By considering the dynamic process of the DC control system, the actual operation condition of the DC power transmission system can be reflected, so thatthe calculation result is more accurate.