The utility model discloses an STATCOM (static synchronous compensator) expansion control system capable of realizing remote communication. The STATCOM expansion control system capable of realizing remote communication comprises a main control cabinet and an expansion control cabinet, wherein data communication between the main control cabinet and the expansion control cabinet is realized through the fiber and high speed serial communication, data communication of each board?card in control cabinets is realized by utilizing a backboard bus, the main control board is communicated with a remote controller through the fiber, and the remote controller realizes remote communication with a communication network through an communication interface. The STATCOM expansion control system realizes data communication of each board?card in control cabinets by utilizing the backboard bus, realizes data communication between the cabinets by utilizing the high speed serial communication, integrates multiple control cabinets into an integral control system, greatly meet different demands of the control system in different occasions and can realize remote monitoring.