Device for improving flatness of underground diaphragm wall

The utility model discloses a device for improving the flatness of an underground diaphragm wall, which comprises a base plate, the base plate is of a plate-shaped structure with a strip-shaped groove in the middle, and threaded through holes for nut connection are formed in the surfaces of the base plate on two sides of the strip-shaped groove; one side of the substrate is connected with the double-wheel mill, and the other side of the substrate is connected with the boss; one side surface of the boss is of a strip-shaped bulge structure, and the other side surface of the boss is provided with a step structure; the protruding structure of the boss is clamped with the strip-shaped groove of the base plate, and the two sides of the boss are connected with the base plate through bolts. A plurality of hole repairing cones and a plurality of hole repairing blocks are welded on the surface of the boss; the device has the characteristics that the structure is simple, the device is convenient to use, the device can