The present invention provides a flexible and foldable organic light-emitting diode (OLED) display device. When the flexible and foldable OLED display device is bent inward, information displayed on an organic light-emitting layer can be directly viewed through a substrate and a drive layer, without extending the flexible and foldable OLED display device, thereby improving usability of the flexible and foldable OLED display device. In addition, display areas at different positions and having different shapes are designed, so that the flexible and foldable OLED display device has more diversified appearances and functions.