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

The invention relates to the technical field of display and discloses a color film substrate and a preparation method thereof, a display panel and a display device. The color film substrate comprises a black matrix and a plurality of color filtering units, the black matrix is arranged between the adjacent color filtering units and provided with a first limiting unit, and the first limiting unit is used for being clamped with a data line on an array substrate. The black matrix opposite to the position of the data line is provided with the first limiting unit for being clamped with the data line, the data line of the array substrate is accurately aligned with the black matrix of the color film substrate, the problem of alignment deviation of the liquid crystal display device can be solved, the cross color and light leak occurrence rate can be reduced, and the product yield is improved. Furthermore, the black matrix and the limiting unit are integrally formed, processes are reduced, the process difficulty is reduced, production efficiency is improved, and materials are saved.