A display screen and a display device are provided. The display device includes: a first display screen; a display screen group arranged on a back surface of the first display screen, the display screen group including at least one second display screen, and a display surface of the second display screen facing the first display screen; and a rotating shaft, the rotating shaft connecting a first side edge of each of the second display screens in the display screen group with a first side edge of the first display screen and being perpendicular to the first display screen and the second display screen. The display device has characteristics of adjustable display screen size and strong flexibility in use.