The invention relates to a suppression subsynchronous oscillation self-adaptive control system based on SVG, and belongs to the field of power system stabilizing and control. The suppression subsynchronous oscillation self-adaptive control system based on the SVG comprises an AD data collection device, a front combined filter, a discrete Fourier transform and subsynchronous oscillation frequency recognizer, a multi-channel independent mode control ring, an online self-adaptive adjuster and a power signal generating device. A control signal is obtained through the self-adaptive control system, the power current of the suppressible subsynchronous oscillation based on the control signal is generated through the SVG, and the suppression subsynchronous oscillation self-adaptive control system is high in subsynchronous oscillation frequency self-adaptation, multifunctional and capable of effectively suppressing power grid subsynchronous oscillation.