The waterproof connector for the cable joint comprises an upper cover plate, a fixed cylinder, a joint placement box, an upper connecting ear, a pressure plate and a sealing cone. The upper and right sides of the upper cover are fixed with the upper connecting ear, and the connecting ear is provided with a device hole, and the joint placing box The lower connecting ears are fixed with the lower connecting ears, the upper connecting ears and the lower connecting ears are fixed by the top fastening nuts, the outer ring of the upper cover is provided with a groove along the outer side, and the outer ring of the joint placing box is provided with a convex ring along the side, and the joint placing box A fixing cylinder is fixed on the left and right sides, a cone hole is arranged inside the fixing cylinder, a sealing cone is arranged in the cone hole, a pressure plate is fixed on the top of the sealing cone, and the pressure plate is connected with the top of the fixing cylinder through the second fastening bolt. The invention seals and encapsulates the cable joint portion, improves the waterproof weak link of the cable joint, greatly improves the waterproof function, and extends the service life of the cable.