The invention relates to a coordinated control method for multistage reactive voltage in an active distribution network. The control method comprises the steps of grading voltage regulation resources in the active distribution network, executing four stages of voltage regulation in sequence from low to high, judging whether the voltage level of the whole network is qualified after each stage of voltage regulation, and when the voltage level of the whole network is qualified, not performing next stage of voltage regulation, wherein the four stages of voltage regulation are respectively first, second, third and fourth ones of a power system realized by using a distributed photovoltaic power supply, reactive power output of a photovoltaic power station, a traditional VQC (Voltage Quality Control) device and active power output of the photovoltaic power station. Compared with the prior art, the control method sufficiently using the scattered voltage regulation resources in the active distribution network has the advantages of effectively reducing the actions of the VQC device, improving the voltage level of the distribution network and the like.