Three-split junction box

The utility model relates to the technical field of junction boxes, and discloses a three-part junction box, which comprises a cathode junction box, a middle junction box and an anode junction box, the opposite sides of the cathode junction box and the anode junction box are clamped with the top and the bottom of the middle junction box, the cathode junction box is provided with a first junction hole, and the anode junction box is provided with a second junction hole. The anode junction box is provided with a second wiring hole used in cooperation with the anode junction box. Connecting bases are installed in the negative electrode junction box, the middle junction box and the positive electrode junction box, conductive metal sheets are fixedly connected to the connecting bases, the conductive metal sheets are of a fan-shaped structure, and strip-shaped protrusions are arranged on the conductive metal sheets. The negative terminal box comprises a first box body and a first plug-in base plate, a first limiting