The invention provides a power cable joint, characterized by comprising: a high voltage shielded tube, a joint body wrapped on the outer side of the high voltage shielded tube, and an optical fiber sensor containing only the optical fiber itself and arranged inside the joint body in a way of penetrating the entire joint body. The optical fiber sensor is some distance away from the edges of the joint body. The optical fiber sensor is connected with a temperature detection system and a power discharge detection system. According to the invention, the structure of the joint detection system is simplified and no area is free of detection. At the same time, the interference of the power discharging phenomenon at the intersecting part to the electric field strength detection can be prevented so as to accurately detect the power discharging condition at the joint body position.