Underground diaphragm wall joint water-stopping process and device

The invention relates to the technical field of joints of underground diaphragm walls, in particular to an underground diaphragm wall joint water-stopping process and device. The underground diaphragmwall joint water-stopping process comprises three steps. The underground diaphragm wall joint water-stopping device comprises a water-stopping structure, the a water-stopping structure comprises twofixed steel plates, two connecting steel plates, an inner steel cylinder, an outer steel cylinder, a plurality of pressing bars, a plurality of supporting plates, a rubber layer and a pretension roller. According to the underground diaphragm wall joint water-stopping process, a plurality of reliable water-stopping belts at joints of underground diaphragm walls, the problem that water leakage occurs on the joints after the excavation of a foundation pit due to the fact that a conventional I-shaped steel joint type is prone to forming a seepage channel on the contact surface of profile steel andconcrete can be effectivel