The embodiment of the invention provides a reactive-power voltage coordination and optimization control method and device and belongs to the technical field of reactive-power voltage optimization of active distribution networks. The reactive-power voltage coordination and optimization control method comprises the following steps: acquiring to-be-processed power grid data; dividing the to-be-processed power grid data into multiple time intervals according to a defaulting rule, and acquiring corresponding target data at each time interval; acquiring an uncertain model for corresponding preset photovoltaic power and load output at each time interval, and substituting the target data into the uncertain model; acquiring a first result output by the corresponding uncertain model at each time interval; performing iterative computations on the first results based on a Gaussian load-flow algorithm so as to acquire a third result corresponding to each time interval; and acquiring a matching value of the third result corresponding to each time interval and a preset ratio, and establishing a reactive-power optimization model by taking the third result corresponding to the matching value as anobjective function.