Display substrate, preparation method thereof and display device

The invention provides a display substrate, a preparation method thereof and a display device, and belongs to the technical field of display. The display substrate comprises a substrate body and pixel units arranged on the substrate body, each pixel unit comprises sub-pixels of various colors, and each sub-pixel comprises a light-emitting device; each sub-pixel further comprises a first lens assembly arranged on the light-emitting face side of the corresponding light-emitting device. The first lens assembly is configured to gather light irradiated by the light-emitting device on the first lens assembly. The number of the first lens assemblies of the blue sub-pixel in the sub-pixels of the multiple colors is larger than the number of the first lens assemblies of the sub-pixels of other colors. The technical problem that the light emitting efficiency of the display substrate is reduced due to the influence of light effect visual angle color cast and the low efficiency of a blue light filtering device can be sol