The invention discloses a method of testing the performance of a controller of a static var generator in wind power plant. The method comprises steps of in a real-time digital simulation instrument, establishing a real-time simulation model for a whole set of the wind power plant, and establishing a real-time simulation model for a major loop of a static var generator system; merging the wind power plant and the static var generator system into a power grid by a transformer in the real-time digital simulation instrument; and taking a power switch tube drive signal output by a static var generator controller as a power switch tube drive signal in the real-time simulation model for the major loop of the static var generator, and forming a control strategy of the static var generator system by real-time computation of the static var generator controller. Therefore, testing of control performance of dynamic reactive power compensation equipment in the wind power plant application background is achieved, the technical effects that the simulation result can be repeated, and the parameter is easy to adjust are achieved, and the method is ensured to be suitable for SVG (static var generator) systems of different voltage and capacitance levels.