The utility model relates to a power grid technology field discloses a subsynchronous oscillation suppression device who restraines electric wire netting flickering, include: the velometer, it connects generating set for detect generating set's rotational speed signal, the controller, its connection the velometer, be used for with rotational speed signal and rated rotational frequency signal that the velometer detected are compared, obtain generating set's rotational speed deviation signal to carry out mode filtering and proportion in proper order to rotational speed deviation signal and move looks, instruct with reactive current in order to generate the active current instruction, the subsynchronous oscillation inhibitor, its connection the controller is used for the drive of controller generates down instructs and corresponding active current and the reactive current of reactive current instruction with active current to pour into this active current and reactive current into generating set and electric wire netting, restrain subsynchronous oscillation in order to pass through reactive current, and restrain the electric wire netting flickering through active current. The utility model provides a subsynchronous oscillation easily produce the problem of electric wire netting flickering in restraining.