Adjustable underground diaphragm wall joint

The utility model discloses an adjustable underground diaphragm wall connector which comprises channel steel (1) and side plates (2). The closed ends of the pair of channel steels (1) are oppositely arranged, and the pair of side plates are respectively connected between the pair of channel steels; a joint space is formed between the pair of channel steel and the pair of side plates, steel bars are bound in the joint space, concrete is poured in the joint space to form a joint body, and the two ends of the joint body are connected with the steel bars of the adjacent underground diaphragm wall through the open ends of the channel steel. Each side plate comprises an adjusting side plate (3) and a hinge (4), one ends of the two adjusting side plates are rotatably connected through the hinge, so that the included angle between the two adjusting side plates is consistent with the included angle between the two adjacent sections of underground diaphragm walls, and the other ends of the two adjusting side plates are