A display panel, a display method thereof and a display device are provided. The display panel includes cylindrical lens array on light emitting side of display substrate. The display substrate includes back plate, pixel definition layer and sub-pixel unit array on back plate. Each sub-pixel unit is in pixel region defined by pixel definition layer and includes at least two secondary sub-pixels; and cylindrical lenses are corresponding to sub-pixel units, each cylindrical lens has cylindrical surface away from back plate, and focus point on surface of a sub-pixel unit away from back plate. In the display panel, multi-viewpoints parallax 3D display compatible with near-to-eye light field display and 2D display with sub-pixels of same gray scale is achieved, effectively reducing the crosstalk, improving Moire phenomenon and increasing stereo perception of the parallax 3D display and solving visual fatigue due to conflict between monocular focusing and binocular convergence.