An organic light-emitting diode (OLED) display panel and an OLED display device have a display region and a non-display region surrounding the display region. The non-display region includes a bonding region, a first fan-out line region, a bending region, and a second fan-out line region. A bonding test region is arranged between the bonding region and the first fan-out line region, a bonding test circuit is arranged in the bonding test region, and the bonding test circuit is used to detect whether a fan-out data line passing through the bonding region is abnormal.