The invention discloses a power cable distribution box capable of realizing cable butt joint. The power cable distribution box has a structure comprising a suction seat, heat dissipating holes, a base, a box body, movable covers, a top plate, a magnetic pressure device, telescopic rods and cable connectors. The suction seat is magnetically connected with and fits the base. Heat dissipating holes in rows and columns are arranged on the side of the base. The box body is welded to the left and right sides of the base. The top of the box body is fixedly connected with the top plate. The side of the box body is in the shape of a trapezoid. The movable covers are connected to the front and rear ends of box body through hinges. The cable connectors are mounted inside the box body. Each movable cover is composed of a cover plate and a cover frame, and the cover plate is welded together with the cover frame. The telescopic rods are hinged together with inner walls on the two sides of the coverframes at one end. According to the invention, the distribution box is fixed by a strong magnet, the magnetic force is strong, the fixing effect is good, the fixing operation is simple and efficient,the removal is facilitated when equipment is aged, and the time and effort are saved.