The utility model discloses a partial discharging high-pass filtering joint of a cable. The joint comprises a T-shaped joint (1), a filter housing (2), an insulating pad column (3), and a filter body (4). The filter body (4) is connected with the filter housing (2) through threads. The filter housing (2) is connected with the T-shaped joint (1) through threads. A male joint (5) is connected with a partial discharging acquisition system (8). A female joint (6) is connected with a cable internal partial discharging sensor (7). Technical effects of the joint are that through connecting the filtering joint, pre-filtering of input signals of the partial discharging acquisition system and ground protection of high-voltage signals are realized, thereby providing convenience for development of subsequent test operation, and filtering effects can be adjusted according to signal characteristics. Thus, cost is saved, and reliability of subsequent signal acquisition is improved.