Colour film substrate, preparation method therefor and display device

A colour film substrate, a preparation method therefor and a display device, relating to the field of display technology. Using the colour film substrate to prepare a display device simplifies a preparation process and reduces costs. The preparation method for the colour film substrate comprises forming, via a one-time patterning process, a plurality of horizontally and vertically intersecting first black matrix (200) and second black matrix (201) patterns and a plurality of first touch electrode (301) patterns located on side surfaces of the second black matrix (201) patterns, the side surfaces being away from a base substrate (10). The first black matrix (200) and second black matrix (201) patterns intersect to define a plurality of colour filter areas (100) arranged in the form of a matrix, and colour filter layer (101) patterns are formed within the colour filter areas (100).