Display substrate, display device and preparation method thereof

The invention provides a display substrate, a display device and a preparation method thereof.The display substrate comprises a substrate body and a plurality of anode structures arranged on the substrate body in an array mode, and each anode structure comprises a first electrode layer, a reflection electrode layer and a second electrode layer which are sequentially stacked; the first electrode layer is arranged close to the substrate, and the thickness of the reflection electrode layer and the thickness of the first electrode layer are both smaller than the thickness of the second electrode layer. The thickness of the second electrode layer is increased by utilizing the microcavity effect, so that the thickness of the second electrode layer is relatively large, the problem that hole injection is unstable due to the fact that the second electrode layer is too thin is avoided, meanwhile, the reflectivity of the anode is improved by utilizing the microcavity effect, and the light emitting brightness of the whol