Display substrate and display device

The utility model provides a display substrate and a display device. The display substrate comprises a substrate; the plurality of pixel units are arranged in an array, each pixel unit comprises a plurality of sub-pixels, and each sub-pixel comprises a first electrode, a light-emitting functional layer and a second electrode which are stacked on the substrate; the light extraction layer is arranged on the side, away from the substrate, of the second electrode, and the light extraction layer is provided with an opening area exposing the second electrode; the auxiliary electrode layer is arranged on the side, away from the second electrode, of the light extraction layer, the orthographic projection of the auxiliary electrode layer and the orthographic projection of the second electrode on the substrate body are at least partially overlapped, and the auxiliary electrode layer is electrically connected with the second electrode through the opening area. Wherein at least one part of light emitted by the sub-pixels enters the auxiliary electrode layer through the light extraction layer and then is transmitted from the auxiliary electrode layer.