The utility model relates to an underground continuous wall, and particularly relates to a wall brushing device for the underground continuous wall. The loaded attached type wall brushing device comprises a bottom plate, wherein the upper part of the bottom plate is provided with a lifting point; the intermediate part of the side surface of the bottom plate is provided with a steel wire brush which is horizontally arranged, clamped through a splint and fixed by using a bolt; the other side surface of the bottom plate is provided with a connecting plate connected with a grab bucket; the connecting plate is provided with a connecting bolt hole. The loaded attached type wall brushing device disclosed by the utility model can be used for cleanly removing the soil and impurities which are positioned in a groove wall and ensures the integral airtightness of the poured underground continuous wall.