Abstract: A mobile computer structure having a rotatable screen is provided, which includes a main body, a rotating arm, and a panel. The rotating arm is pivotally disposed on the main body and is pivotally rotated between a first position and a second position. The panel has a display surface and a casing surface and is pivotally connected to the rotating arm. When the rotating arm pivotally rotates to the first position, the panel is attached to the main body with the display surface facing the main body, and when the rotating arm pivotally rotates to the second position, the panel is attached to the main body with the casing surface, thus making the display surface or the casing surface optionally face outside to achieve the purpose of protection or using.