The invention provides an OLED display device, comprising an OLED display panel and a first driving circuit connected to the OLED display panel. A DC signal line is disposed in an active area of the OLED display panel. A non-active area is disposed with a first DC signal output end and a second DC signal output end, located at two opposite ends of the OLED display panel. One of the two adjacent DC signal lines receiving a signal from the first DC signal output end, and the other from the second DC signal output end so that the impedance changes in the two adjacent DC signal lines are reversed in the signal transmission process. The display unevenness of two adjacent sub-pixels can compensate each other to reduce the impact of voltage drop of DC signal line on the display evenness of the OLED display device to improve display quality.