The invention belongs to the technical field of the large size electrical equipment testing, and particularly relates to an anti-interference method and device for a cable partial discharge test. A high voltage single-core power cable partial discharge on-line monitoring anti-interference method is provided, or in another word, an impulse time relay identification method based on a dual high frequency current sensor. The specific implementation of the method comprises that when testing the partial discharge of a power cable, simultaneously collecting is firstly carried out by two high frequency sensors, an interference pulse is filtered by using an impulse time relay of a signal of a two-way sensor, so that the direction and the origin of the interference pulse is judged, and therefore testing on the partial discharge of the cable is more accurate.