Abstract: Provided is an assemblable wood brick. A unit of wood brick is composed of five plates including a top plate, two opposite first lateral plates and two opposite second lateral plates. Dovetail tenons, dovetail sluts, sluts and protrusions are correspondingly defined on sides each of the five plates such that the five plates are securely and orthogonally connect to each other at their sides to form a brick unit having a space defined there-inside. In addition, blind hole(s) can be provided on the outer surface of each one of the five plates such that any two brick can stably connect to each other by a fixed member corresponding to and engaging into the holes. Several types of furniture and constructions can be formed by connecting suitable amount of the bricks. Further, blind holes can be defined on both top side and bottom side of the second lateral plates such that any two bricks can stably connect to each other by a fixed member corresponding to and engaging into the holes.