The utility model provides an outer decorative aluminum board articulates system, includes support and couple for fix outer decorative aluminum board on the curtain, the curtain includes wall keel and curtain panel. The support is the body structure that the cross section is T shape, the transverse part of T shape is the rectangle stand, runs through to have articulating hanging scroll a little as the couple on the rectangle stand perpendicularly, the upright portion of T shape is board even, even the board pass the curtain panel board stitch fixation on wall keel, the couple is the body structure that the cross section is L shape, comprises orthogonal connecting plate and hitch plate, and one side that hitch plate kept away from the connecting plate has an opening at least, forms the hook, and the hook connects at the hanging scroll, hitch plate fixes outside on the decorative aluminum board. The utility model discloses a positive and negative wind pressure be connected more weak problem between aluminum plate and the fossil fragments when great, can strengthen being connected between aluminum plate and the fossil fragments, it is out of shape to prevent that aluminum plate from appearing moving and producing, makes aluminum plate curtain atress system obtain the assurance.