This invention is relevant to a steady bed cover of pickup truck. The bed cover includes at least two plates. The adjacent plates are connected by rotating shaft structure. This invention provides a steady bed cover of pickup truck with simple structure and great leading function. The connecting strength of rotating shaft structure is enhanced with the cooperation of the ladder-like hook and strip convex. When the bed cover of pickup truck is laid horizontally, the rotating part and the rotating shaft part are subjected to reverse force and are mutually matched, thus enhancing the stability of the bed cover.