The invention relates to a DC commutation influence degree-based transient voltage disturbance suppression method and device. The method comprises the following steps of S1, acquiring recording wave fault data, and determining disturbance time when a disturbance event is monitored; S2, calculating transient voltage disturbance quantity of a linear voltage according to the disturbance generation time; S3, calculating transient disturbance voltage time product of the linear voltage according to the transient voltage disturbance quantity; S4, acquiring an evaluation result of each disturbance event on DC commutation influence degree according to the disturbance voltage time product of the linear voltage; and S5, suppressing the transient voltage disturbance of an AC system according to the evaluation result. Compared with the prior art, the method has the advantages of high reliability and the like.