A flexible display device for displaying electronic information has a main body, a small screen, a reel mechanism, a scrolling display and a wrist strap. The screen is disposed on the main body for displaying information. The reel mechanism is disposed on the main body. The scrolling display is rolled and hidden in the main body by the reel mechanism for displaying information, wherein the scrolling display is a CLC display or an OLED display. The wrist strap connects with the main body for securing the main body around a wearer. The scrolling display has a screen puller connected to one side thereof for pulling out the scrolling display. The flexible display device is portable, and usable in a fixed state. In addition, the flexible display is not easily to get lost and lessens abrading of the monitor's surface of the scrolling display from usual wear and tear.