The utility model relates to a subsynchronous oscillation suppression device for a generator set based on a fully controlled type converter, which comprises a speed measurement cabinet, a controller, a fully controlled type converter SVG and a step-down transformer, wherein, the speed measurement cabinet is connected with an output end of a generator; and the other end of the speed measurement cabinet is connected with the controller through an optical cable; the other end of the controller is connected with the fully controlled type converter SVG; the other end of the fully controlled type converter SVG is connected with the step-down transformer via a 35 kV bus; the other end of the step-down transformer is connected with a 500 kV bus; a voltage transformer PT8 and a current transformer CT of the 35 kV bus are connected to an output end of the controller 7; and the generator is connected with the 500 kV bus through a 20 kV bus and a step-up transformer. The utility model can effectively solve the subsynchronous oscillation problem of a power network system, and has the advantages of high response speed, high tracking accuracy, and capability of greatly improving the stability and the reliability of a power network.