Novel joint device of underground diaphragm wall

The utility model discloses a novel joint device of an underground diaphragm wall. The novel joint device comprises two opposite and parallel wing plates, two opposite and parallel side plates are connected between the two wing plates, the end faces of the two sides of each side plate are fixedly connected with opposite wing plates respectively, and the distance between the side plates is smaller than the width of each wing plate. The box body is composed of steel plates and steel bars in a welding mode, and is easy to manufacture. Four corners of the top face of the box body are respectively provided with one hanging ring, the whole box body can be hung and can be freely moved by moving steel wire ropes, and moving installation operation is convenient. The wing plates are long and can effectively prevent around flowing. Connected groove sections of box type joints can be continuously or synchronously constructed, the connected groove sections do not need to be constructed after final setting of poured concre