The application discloses a multipath partial discharge signal parallel connection apparatus. The apparatus comprises a signal input interface, a signal pre-processing circuit, a signal isolation circuit and a signal output interface, wherein an input end of the signal pre-processing circuit is connected with the signal input interface; an input end of the signal isolation circuit is connected with an output end of the signal pre-processing circuit; and the signal output interface is connected with an output end of the signal isolation circuit. The multipath partial discharge signal parallel connection apparatus, through performing isolation processing of multipath signals, enables the signals to self-trigger one-way transmission and isolation, realizes interference-free parallel conduction of multipath partial discharge signals, and thus prevents loss of signals in a signal transmission process. At the same time, since the partial discharge signals in parallel connection are transmitted to a signal bus, a data acquisition apparatus can monitor multiple signals at the same time, and thus data acquisition can be performed by using the same data acquisition apparatus, and the cost is reduced.