The present invention is an electrical connector housing comprising a central segment and two connector holders. The central segment has two sides and two wings. The wings are formed respectively on and protrude respectively from the sides of the central segment, and each wing has parallel grooves. The connector holders are mounted pivotally respectively on the wings, and each connector holder has a notch. Each notch has two edges and two tracks. The tracks are formed respectively near the edges, are mounted pivotally respectively in the grooves and enable the connector holder to pivot up to 180 degrees relative to the central segment.