Joint connection and construction method of prefabricated underground diaphragm wall and cast-in-place composite wall

The invention discloses a node connection and construction method of a prefabricated underground continuous wall and a cast-in-place composite wall, and the node connection comprises a prefabricated underground continuous wall, the prefabricated underground continuous wall is fixedly connected with a cast-in-place underground continuous wall, and a cast-in-place buttress is poured on the inner side of the joint of the prefabricated underground continuous wall and the cast-in-place underground continuous wall. A cast-in-place structure side wall is cast on the inner side of the cast-in-place underground diaphragm wall and the side wall of the cast-in-place buttress; the construction method comprises the following steps: processing the prefabricated diaphragm wall; a cast-in-place diaphragm wall reinforcement cage is bound, and welding angle steel is installed; underground diaphragm wall grooving construction is carried out; scabbling the surface of the joint of the prefabricated diaphragm wall, and pasting a w