A pixel arrangement structure for an organic light-emitting diode display panel includes a plurality of first subpixel rows and a plurality of second subpixel rows alternating with the first subpixel rows. Each first subpixel row includes first subpixels and second subpixels alternating with the first subpixels. Each second subpixel row includes alternately disposed first, second, and third subpixels. The number of the third subpixels in each second subpixel row is two times the number of the first or second subpixels in the second subpixel row. The subpixels of the same type in each of the first and second subpixel rows are not adjacent to each other. RGB pixels are formed by combinations of the subpixels in the first subpixel rows and the subpixels in the second subpixels. The color mixing effect is improved, and the resolution is increased.