The invention discloses a reactive coordination control method for a direct current converter alternating current filter and a phase modifier. The reactive coordination control method comprises the steps of reserving enough dynamic reactive power storage for operating points of the phase modifier in a steady-state condition of a direct current converter alternating current voltage; for ensuring the dynamic reactive power storage of the phase modifier while a condition of switching of the alternating current filter is needed, controlling the phase modifier to act in advance, controlling the reactive power increasing or decreasing direction to be opposite to the reactive power changing direction caused by switching of the alternating current filter, so as to reduce alternating current voltage fluctuation caused by switching of the alternating current filter; and under the condition of the direct current converter alternating current voltage fluctuation, if the extremity of the phase modifier is reached while the alternating current voltage still cannot be regulated to a preset value, performing rapid switching of the alternating current filter for ensuring stability of the alternating current voltage. By virtue of the reactive coordination control method, the technical problem of not high coordination degree between the phase modifier and the direct current converter reactive compensation equipment in the prior art is solved, and the stability of an alternating current and direct current parallel serial system can be reinforced.