The invention relates to a positive and negative sequence current control method of a DFIG converter under an asymmetric fault of a power grid. Through establishing positive and negative sequence current control instructions of a rotor-side converter under a constant electromagnetic torque and the positive and negative sequence current control instructions of a grid-side converter under constant output active power, a100 Hz generalized embedded integrator is designed to implement DIFG positive and negative sequence current uniform control so that a mechanical stress on a wind turbine generatorshaft system is mitigated and power supply and demand balance, safety and stability of a power grid are ensured.