Abstract: A connection device of screen fixtures involving a horizontal U-shaped top bar, a horizontal U-shaped bottom bar, at least one horizontal U-shaped horizontal bar, at least one I-shaped vertical bar with ribs on both inner sides, and at least one L-shaped object having a short leg and a long leg and having a frame at the intersection of the short leg and the long leg, the long leg having two screw holes for attaching the long leg to a vertical bar by two screws, the short leg having a screw hole for attaching the short leg to a top bar or the bottom bar by a screw.