Notebook computer pivot device

A notebook type computer interchanger has a rotating seat, a pivot connected immovably on the two sides of the top surface of the rotating seat is connected with a screen, the screen is lifted up by using a pivot as the axes, the bottom of the rotating seat is extended with a pivot unit which is penetrated and fixed immovably on the positioning seat of a main machine body; a positioning ring slice, a first and a second retaining ring slices and a spring slice inside the positioning seat are clamped in the pivot unit and a friction buckle slice is arranged to buckle and position the slices, depending on the friction of each ring slice and the positioning seat, when the pivot unit rotates vertically along the axial direction, the pivot unit can achieve stable effect, the first and the second retaining slices have retaining grooves presented as semi-arc shapes, the positioning ring slice can move inside the retaining groove by employing group arranged positioning protruding columns, so the positioning ring slice can rotate in both directions. Therefore, the user can rotate the screen for any angle to achieve the most suitable viewing angle.