The invention provides a wind power plant coordination fault ride-through method through a flexible DC power transmission grid-connected system. Voltage reduction control of the flexible DC system wind power plant side converter is combined with flexible control of the wind turbine generator set crowbar to suppress the system overcurrent by using the rectifier bridge type crowbar protection circuit of the doubly-fed blower rotor side in the period of the unipolar short time fault of the DC system, and real-time control of active power and current is realized by regulating the blower end voltage in the control period so that the power transmission capacity of the non-fault polarity of the flexible DC system can be realized to the greatest extent, the situation of off-grid of the wind powerplant can be avoided, the impact to the AC power grid can be reduced and the method has certain significance in practical engineering.