The invention relates to a method for improving vertical bright and dark lines of a display panel and a device thereof. The device comprises the display panel, an ordering module, a scanning signal driving module and a data signal driving module; the display panel comprises a plurality of pairs of scanning lines, a plurality of data lines and a plurality of pixel units; the plurality of pairs of scan lines are arranged in a row direction; the plurality of data lines are arranged in a column direction; the plurality of pixel units are arranged between each pair of scan lines and arranged in a matrix, and each adjacent two columns of pixel units share a data line, the pixel unit sharing one data line is connected to different scan lines, and each column of pixel units is a pixel of the samecolor, and the pixel unit is regularly arranged in six columns; the ordering module is configured to change a color arrangement sequence of each adjacent six columns of pixel units to a preset sequence; the scanning signal driving module is configured to input a scan pulse signal to the scan lines; and the data signal driving module is used to input a square wave data signal to the data line to improve vertical bright and dark lines on the display panel.