A common electrode of a display panel is disclosed. The common electrode is located at a side of a gate driving device of the display panel, and the common electrode includes multiple main trunk electrodes arranged sequentially along a row direction, along the row direction, from a side closed to the gate driving device to a side away from the gate driving electrode, in adjacent two main trunk electrodes, a common voltage on a previous main trunk electrode is less than or equal to a common voltage on a next main trunk electrode, and a common voltage of a first main trunk electrode is less than a common voltage on a last main trunk electrode. The present invention can reduce the uneven display caused by RC delay on the transmission of the scanning signal.