The invention discloses an over-point automatic starting rotating shaft including a fixed plate, a movable plate, a rotating shaft, a cam wheel, a recessed wheel, an elastic element and a resistance providing device. A first shaft sleeve is arranged on the fixed plate, a second shaft sleeve is arranged on the movable plate, and each of the first shaft sleeve, the second shaft sleeve, the cam wheeland the recessed wheel axially and slidably sleeves the outer side of the rotating shaft. Stop members at two ends of the rotating shaft abut against two axial ends of an integral stacked structure formed by the first shaft sleeve, the second shaft sleeve, the cam wheel and the recessed wheel, the second shaft sleeve is capable of rotating relative to the rotating shaft, one of the cam wheel andthe recessed wheel is stopped and positioned in a circumferential direction of the second shaft sleeve, and the cam wheel and the recessed wheel are in tight contact through an axial concave-convex curved surface. The resistance providing device is capable of providing resistance for rotation of the second shaft sleeve. The elastic element is capable of providing an elastic torsion force for the second shaft sleeve within a set angle range, wherein the elastic torsion force enables the movable plate to rotate in a direction away from an opening direction of the fixed plate. By using the over-point automatic starting rotating shaft, a display screen can be stably closed, and the display screen of a notebook computer can automatically bounce when being opened so as to be convenient to use.