Display substrate and amoled display device

A display substrate, comprising a display area, wherein the display area comprises a plurality of pixel units arranged in an array, each of the plurality of pixel units comprises a driving transistor, each row of pixel units is correspondingly provided with a first power line, each column of pixel units is correspondingly provided with a second power line, the driving transistor in each pixel unit is electrically coupled to the second power line corresponding to a column in which the pixel unit is located, and each second power line is electrically coupled to each first power line;

• a first power bus and a second power bus are respectively provided on two sides of the display area in an extending direction of the second power line, a third power bus and a fourth power bus are respectively provided on two sides of the display area in an extending direction of the first power line, one end of the first power bus is coupled to one end of the third power bus, the other end of the first power bus is coupled to one end of the fourth power bus, one end of the second power bus is coupled to the other end of the third power bus, and the other end of the second power bus is coupled to the other end of the fourth power bus;
• and
• at least two of the first power bus, the second power bus, the third power bus, and the fourth power bus are configured to respectively supply a power supply voltage to power lines correspondingly coupled thereto, wherein power lines correspondingly coupled to the first power bus and the second power bus are the second power lines, and power lines correspondingly coupled to the third power bus and the fourth power bus are the first power lines.