The invention provides a decomposition coordination voltage control method for wind power via a flexible DC outgoing proximity region, and belongs to the technical field of power system voltage control. The method comprises equating a wind farm connected to a flexible direct current via a collection station to an equivalent wind farm; using each equivalent wind farm and each wind farm directly connected to the flexible direct current as individuals to independently solve the voltage control problem; during each iteration, enabling the wind farms to establish and solve respective voltage control optimization sub-problems, and uploading results to a control center; establishing and solving, by the control center, a voltage coordination optimization main problem, and determining the convergence of a result; and if the result converges, obtaining the reference values of the flexible direct current controller and the internal wind-driven generator and the dynamic reactive power compensationdevice of each wind farm. The method reduces the scale of the control problem and the communication burden, and ensures the optimal voltage control optimization, and realizes the safe operation of wind power via the flexible DC outgoing proximity region.