The invention provides a received power network dynamic frequency security quantitative evaluation method based on trajectory sensitivity. The method comprises the steps that a traditional frequency response model is used to analyze the dynamic frequency characteristic of a received power network, and time corresponding to the maximum value of dynamic frequency deviation is calculated; the trace sensitivity of the inertia time constant, a difference adjustment coefficient, a damping coefficient and the reheating time constant in an SFR model are calculated; the inertia time constant and the difference adjustment coefficient are selected as parameters to be identified, and a nonlinear least squares method is used to solve the calibration model of two parameters to calibrate the parameters; the dynamic frequency and time of the received power network are integrated in an integral manner to acquire the dynamic frequency accumulation offset of the received power network; the dynamic frequency quantification evaluation index of the received power network is set up; the dynamic frequency quantification evaluation index is used to carry out security quantitative evaluation and the like on the received power network. According to the invention, simply through known active power shortage, the dynamic frequency quantification evaluation index can be calculated, so that the calculation amount is small.