Abstract: Since the static var generator (SVG) has the advantages of high response speed and continuously adjustable reactive power, it is widely used in new energy stations. However, due to its large general capacity, grid-connected performance testing cannot be evaluated through field testing. Based on RT-LAB platform, this paper uses the SVG controller on site to build a complete hardware-in-loop simulation system. With the help of the photoelectric conversion tools and the simplified number of bridge-arm modules, the hardware-in-loop simulation of SVG is realized, and the simulation test evaluation of the grid adaptability is carried out. Through the disturbance test of voltage and frequency, it is verified that RT-LAB can complete the SVG grid-connection adaptability simulation test.