The invention discloses a cable joint used in a humid environment. The cable joint is used in a working environment filled with liquid drops and spray. The cable joint comprises a pair of symmetrically-arranged housing bodies used for storing head parts. A sealing rubber pad and sealant are arranged on a joint face. Each of the housing bodies comprises a ball-shaped part, a flange part and a pipe penetrating part. A thread structure and a cone-shaped closing opening are arranged on/in the outer port of each of the pipe penetrating parts. A through hole end part is arranged in each of the cone-shaped closing openings. The taper is controlled to be between 5 DEG and 10 DEG. Effective slope length is no less than 5cm. The inner screw threads of threaded sleeves cooperate with outer screw threads of the pipe penetrating parts. One closing opening is arranged in one side near each of outer ends. According to the invention, the cable joint has high composite humidity resistance performance; and joints of flanges well cooperate with the pipe penetrating joints, thereby preventing water from entering into the cable joint.