The invention provides a cable-connected water interception buoy, and relates to the field of navigation buoys. The cable-connected water interception buoy comprises a buoy body, a filling hole is formed in one end of the buoy body and provided with a sealing cover, a sleeve penetrating through the two ends of the buoy body is arranged at the center of the buoy body, connecting discs are fixed tothe two ends of the sleeve correspondingly, the outer sides of the connecting discs are in sealed connection with the buoy body, the centers of the connecting discs are rotationally connected with theouter side of a connecting pipe, and cable clamps are fixed to the two ends of the connecting pipe correspondingly. According to the cable-connected water interception buoy, part of water wave impactforce is offset, thus tension of a cable is decreased, and the service life of the cable is prolonged; sealing pads are arranged between the connecting discs and the buoy body, thus the situation that due to mutual friction between the connecting discs and the buoy body, the buoy body is damaged can be avoided, and the buoy body is effectively protected; and through connection between connectingplates and clamping rings, the buoy body and the cable are fixed more easily and more conveniently, through clamped connection between clamping blocks and clamping grooves in the clamping rings, the cable and the cable clamps are kept in a fixed state, and the more labor-saving effect is achieved during assembly.