The utility model relates to a wall brick, and particularly relates to a porous construction waste wall brick. The porous construction waste wall brick mainly solves the technical problems that in the prior art, the wall brick has complex structure and high production cost, and the wall brick is not energy-saving and environment-friendly because the wall brick is sintered by common clay. The porous construction waste wall brick provided by the utility model comprises a wall brick body (1), and the porous construction waste wall brick is characterized in that two cavities (2) are formed in the middle of the wall brick body (1), the cavities are rectangular, and three elongated holes (3) are respectively formed at the edges on the two sides of the wall brick body.