Color film substrate, display panel and preparation method thereof, and display device

The invention discloses a color film substrate, a display panel and a display device. The color film substrate comprises a base substrate, a colored filter layer and a phase reversal pattern, wherein the colored filter layer and the phase reversal pattern are arranged on the base substrate, the phase reversal pattern comprises multiple openings, the multiple openings correspond to multiple filter units of the colored filter layer, and the phase reversal pattern is used for defining the boundary of each filter unit; the projection of the phase reversal pattern on the base substrate is at least partially covered on the projection of an area between adjacent filter units on the base substrate; and the phase reversal pattern is configured for enabling light passing through the phase reversal pattern to generate phase reversal. The color film substrate can replace or partly replace a black matrix by forming the phase reversal pattern on the base substrate, and due to the adoption of the color film substrate, the generation of light leak caused by bending, of the display panel, can be prevented.