An ultra mobile PC relates to improvement of an ultra mobile PC. The invention provides an ultra mobile PC which has simple structure and is convenient to use and is highly portable. The ultra portable PC of the present invention comprises a second housing, a male lock, a female lock, a sleeve, a first housing, a first screen, a second screen, and a soft keyboard; the ultra mobile PC is characterized in that the first housing is provided with the first screen; the first housing is connected with the second housing, and the second housing is provided with a second screen; the second screen canbe rotated for 360 DEG and 180 DEG; when the second screen is rotated for 360 DEG, the first screen is used only and the first screen is a touch screen; at the same time, the soft keyboard can also betaken out for using. when the second screen is rotated for 180 DEG, the second screen can be a touch keyboard or a display screen and is controlled by a soft keyboard.