The utility model discloses a brick joint concave rib, which is a long strip construction decorative proximate matter, contour forged by alloy or engineering plastic; the brick joint concave rib is composed of only one flute board, the radial cross section of the flute board is V-shaped, the surface on two sides of the V-shaped slant is provided with a plurality of rough patterns; the flute in the flute board is in four forms of V shape, arc shape, square shape and trapezoid shape, the bottom of the outer surface is an arc or a right angle, the brick joint rib has low manufacturing cost, and is used for treating and decorating the coarse cement seams left by paving the decorative bricks. Not only the installation is simple, convenient, but also a V-shaped brick joint decorative rid which has uniform size, flat groove face, and obvious outline is obtained.