Split arc angle for decorative wallboard

The utility model relates to the technical field of building decoration projects, and particularly discloses a split arc angle for a decorative wallboard, which includes a cover plate and a base, wherein the cover plate is a cylindrical surface arc plate; the base is a strip-shaped structure, the cross section of the base is identical with an equal leg angle in shape, and an insert lug and a lock lug are arranged on the two inner sides of the base; and the cover plate is fastened with the base. The split arc angle is characterized in that the arc angle of the decorative wallboard is wholly connected with the decorative wallboard through a self-tapping screw and positioned by a middle aluminum material, so as to ensure the position to be correct, the mounting to be convenient, and the construction error to be low; the lugs are inserted into the cover plate and the base through the lip parts of a fastener, as the arc angle is split, the self-tapping screw is hidden inside the arc angle and in smooth transition with the wallboard, no trace of the aluminum alloy angle arc can be seen at the internal corner, the cover plate at the external corner can be baked finished into the same color as the wallboard, so as to beautify the appearance; and as the angle is easily damaged, the cover plate can be directly replaced after the angle is damaged, and the split arc angle is simple to dismount and re-mount.