An irregular display panel and a display device are provided. A display region has an irregular boundary. The display panel includes low-luminance pixels, and normal pixels arranged away from the irregular boundary. The pixel rows and/or the pixel columns include pixel groups each including a first pixel group and a second pixel group. The number of pixels adjacent to the irregular boundary in the first pixel group is greater than that in the second pixel group, and the number of low-luminance pixels of the first pixel group is greater than or equal to that of the second pixel group. The pixel includes at least three sub pixels each including an electrode having at least one slit. The total slit lengths of the low-luminance pixels in a same pixel group increase gradually in a direction from the irregular boundary to the display region.