Connecting structure of diaphragm wall and main body structure and construction method of connecting structure

The invention relates to a connecting structure of an underground diaphragm wall and a main body structure and a construction method of the connecting structure. The connecting structure comprises a mounting groove reserved in the underground diaphragm wall and corresponding to the joint of the underground diaphragm wall and the main body structure; the base is inserted into the mounting groove; the telescopic pieces are vertically mounted on the top surface and the bottom surface of the base; the driving assembly is mounted on the base and is in driving connection with the telescopic piece; the buffer assembly is mounted on the side, close to the notch of the mounting groove, of the base, abuts against the inner wall of the notch of the mounting groove and partially extends out of the mounting groove to form a connecting part; the clamping groove is formed in the inner side face of the underground diaphragm wall and located above a groove opening of the installation groove. The hydraulic assembly is mounted