The invention discloses a static synchronous compensator for a nonlinear load of a wind power generating set. The static synchronous compensator consists of at least two basic capacity units in cascade connection, wherein the basic capacity units are respectively encapsulated in a casing, each basic capacity unit comprises a detecting module, a control module and an IGBT driving module which are integrated on a circuit board, and further comprises an IGBT and an electric reactor; the input terminals of the detecting modules detect current signals and voltage signals of an electric grid, the output terminals of the detecting modules are connected to the input terminals of the control modules, the output terminals of the control modules are connected with the IGBTs through the IGBT driving modules, and the IGBTs are connected in parallel with the electric grid through the electric reactors. For the static synchronous compensator disclosed by the invention, the modular design is adopted, and machines do not need to halt during expansion or maintenance, so that the static synchronous compensator is convenient and rapid to use; the damages of electric components cannot cause the pause of the whole device, so that the running stability of the device is greatly improved.