The invention relates to the technical field of building devices and particularly relates to a building brick. The brick comprises a brick body, positioning holes, positioning pillars and limiting plates, wherein the positioning holes are formed in the upper part of the brick body; the positioning pillars are arranged at the lower part of the brick body; the positioning pillars pass through the limiting plates. Through the adoption of the design of the positioning holes and the positioning pillars in the building brick, the positioning pillars just need to be inserted into the positioning holes in a using process, so that the joint aligning time is greatly reduced; the building efficiency is improved; meanwhile, the building quality is improved; through the adoption of the design of the limiting plates, the brick joints of each layer are equal in height; adhesives in the brick joints are same in thickness; the quality standard is unified; the appearance of the building brick is improved.