The utility model relates to a wall brick, in particular to a construction waste wall brick, aiming at solving the technical problems that the wall bricks in the prior art are more complicated in structure and higher in production cost, and the wall bricks are sintered by unselected clay, thus being not energy-saving and environment-friendly, and the like. The construction waste wall brick comprises a wall brick body (1), and is characterized in that a cavity (2) is arranged in the middle of the wall brick body (1); the cavity is rectangular; and two slot holes (3) are respectively arranged at the two sides of the cavity.