The invention relates to a building block which comprises a building block base body, pluggable columns and pluggable openings. At least one splicing face of the building block base body is provided with the plugging column and the pluggable opening at the same time, the reverse splicing face is provided with the pluggable column and the plugging opening matched with those of the splicing face anddoes not share the same face of the splicing face, the pluggable columns and the pluggable openings are arranged on the splicing face and the corresponding reverse splicing faces, during splicing, and due to reverse hooked connection of the pluggable columns and the pluggable openings, splicing is more stable.