The invention relates to a double-feed wind power generator low-voltage through control system based on an energy storage device, which comprises a double-feed motor, a grid side converter, a machine side converter, a voltage detection device, the energy saving device and a low-voltage through control module. The double-feed motor is serially connected to a power grid through the machine side converter and the grid side converter, the energy saving device is connected between the double-feed motor and the power grid, an unloading circuit is parallelly connected between the machine side converter and the grid side converter, the voltage detection device is connected between the power grid and the low-voltage through control module, the low-voltage through module controls the connection andthe disconnection of the energy saving device and the unloading circuit, i.e. the energy is first absorbed by the energy saving device, then the energy is released by the unloading circuit and finally the energy is fed back by the energy saving device, so that the electromagnetic torque, reactive power and the pulse of direct current bus voltage are effectively suppressed, the current of a rotor is limited, required power support is provided when the power grid is recovered, a generator can be always connected with the power grid, and low-voltage through is realized.