The invention provides a method for improving the transient stability of a terminal power grid with a high proportion of wind power. The method comprises the steps that 1 the grid structure of the system is determined; 2 a fault in the system is set based on historical data in the system, and is removed within specified time; the location of energy storage is determined; a branch set with the largest phase angle difference around the fault point is selected to install an energy storage device, and the ability of energy storage to quickly absorb and release energy is used to bring the maximum support to the transient stability of the system; the location with the maximum frequency of occurrence is the failure point of the system; and 4 according to an energy storage control strategy, an energy storage control signal is to enable the strategy to quickly absorb or release transient energy in a weak branch to maintain the stability of the system. According to the invention, the access position of energy storage can be determined through a transient energy method under the condition that the grid structure of the system is determined; the weak branch in the system is more specifically protected; the transient stability of the system is further supported; and the energy storage device can be used efficiently.