The invention relates to a doubly-fed wind turbine generator low-voltage ride through method. According to the invention, DC bus voltage is detected at real time. When DC bus voltage is greater than or equal to trigger voltage Uchopper of a chopper circuit, a switching device in the chopper circuit is controlled to be switched on, and energy release is carried out through a loading shielding resistor. In the specification, UGp_d is network voltage positive-sequence d-component, UN is rated network voltage, X is a set voltage threshold value, and A and B are set proportionality coefficients which are both greater than 1. Uchopper is not a fixed value but is divided into two parts: one part is a constant value; and the other part is in direct proportion to the rated network voltage. When the rated network voltage becomes larger, trigger threshold of the chopper circuit is increased. Then, unnecessary energy release is prevented to some extent, and electric energy is saved. In addition, effective trigger of the chopper circuit also can be guaranteed, and damage to the switching device in a current transformer is avoided.