Multifunction decoration building block

The utility model relates to a multifunction decoration building block. A dovetail groove is arranged on one side surface of a building block body; the building block body is provided with holes which are separated by dividing wall entities; one or two pin key grooves are vertically and symmetrically arranged on each of two side surfaces of the building block body; pin keys are inserted into pin key holes for connecting an upper layer of building block and a lower layer of building block; and pin keys for connecting adjacent building blocks are inserted in the pin key grooves. The building block has good weight-bearing property, decoration performance and wall integrity, can strengthen the integrity among the wall building blocks, improve wall construction quality, replace construction mortar partly or completely, and improve construction speed, and can be used as not only weight-bearing wall material and but also self-bearing wall material or outer decorative wall material.