The invention discloses a reactive power voltage coordination control method applicable to a rigid-DC weak-AC hybrid power grid. In the case of normal operation at a rectifier side, the rectifier side adopts constant current control; when voltage of a certain layer of converter bus in a receiving-end system sags to enable DC voltage to sag to a boot threshold, a low-voltage current-limiting control link at the rectifier side is activated, and a DC system is in a current control mode under the low-voltage current-limiting control; in the case of normal operation at an inverter side, the switch of a circuit breaker is cut off, and the inverter side adopts constant voltage control; the minimum value of an extinction angle of a double 12 pulse converter at the inverter side is taken as the minimum extinction angle, when the minimum extinction angle is smaller than 7 DEG, the switch of the circuit breaker is triggered to be on, the maximum value of rectifier-side PI link output beta1, inverter-side PI link output beta2 and beta 3 is taken as beta, and the triggering angle alpha of the inverter is equal to 180 DEG-beta. Thus, stabilization of AC voltage at the receiving end is facilitated, reactive power fluctuation is reduced, and the possibility of commutation failure is reduced.