The invention discloses an STATCOM (Static Synchronous Compensator) additional control method for improving the recovery rate of a near-field DC commutation failure. The STATCOM additional control method is characterized in that the feasibility of STATCOM additional control is evaluated according to a voltage correlation factor between an AC bus connected with an STATCOM and a DC commutation bus;if the evaluation result indicates that the STATCOM additional control is feasible, an additional controller is added to an STATCOM AC controller; and an AC reference value is amended according to a running state of a near-field DC system. After the DC commutation failure, the dynamic reactive support capability of the DC near-field STATCOM is fully utilized, the voltage level of the commutation bus is improved, and quicker recovery of a DC system is helped. By adoption of the STATCOM additional control method, the structure of the original controlle of the STATCOM is not changed, the STATCOMadditional control method can be implemented simply and conveniently, different running conditions in the DC system are drawn in consideration in a control logic, the adaptability is strong and the reliability is high.