The disclosure discloses a color filter substrate, a method for fabricating the same, and a liquid crystal display panel, the color filter substrate includes: a base substrate; a photonic crystal layer formed on a side of the base substrate, wherein color resistance areas corresponding to sub-pixel elements in a one-to-one manner are arranged at the photonic crystal layer and color resistance areas in different colors are arranged alternately; an arrayed waveguide grating layer arranged on a side of the photonic crystal layer facing away from the base substrate, wherein there are different angles of gratings at the arrayed waveguide grating layer to control output light rays to be irradiated onto different color resistance areas of the photonic crystal layer at different incident angles; and a wave separating layer formed on a side of the arrayed waveguide grating layer facing away from the base substrate.