Display substrate and display device

The invention provides a display substrate and a display device, relates to the technical field of display, and aims to solve the problem that in an existing display product, under the condition that a narrow frame is met, the brightness uniformity of the display product is poor. The display substrate comprises a first power line and a multiplexer circuit, the first power line comprises a first power supply part, a second power supply part and a plurality of power supply connecting parts, the plurality of power supply connecting parts are located between orthographic projections of the first power supply part and the second power supply part on a substrate, and the power supply connecting parts are respectively coupled with the first power supply part and the second power supply part; at least part of the orthographic projection of the multiplexer circuit on the substrate is located between the orthographic projection of the first power supply part on the substrate and the orthographic projection of the second power supply part on the substrate; the multiplexer circuit comprises a plurality of multiplexer units, and the multiplexer units and the power supply connecting parts are alternately arranged.