The invention discloses an additional damping control method for a virtual synchronous generator controller. The method is characterized by, based on a wide-area data measurement and acquisition system, transmitting signals of synchronous generator rotation speed and output power and the like in an electric system to the virtual synchronous generator controller; taking change amount of the collected signals with respect to their steady-state values respectively and carrying out filtering, amplification and phase correction in sequence and correcting an active torque reference value of the virtual synchronous generator controller; and through an active ring, by simulating a rotor motion equation of a synchronous generator, correcting frequency and phase of the output voltage of the virtualsynchronous generator, thereby realizing a purpose of adjusting the output power to suppress power oscillation of the electric system. The control method can effectively improve low-frequency oscillation suppression capability of the virtual synchronous generator controller, thereby facilitating realizing safety and stability of a power grid under the condition of large-scale renewable energy gridconnection.