Display substrate and manufacturing method thereof, and display device

A display substrate, comprising:

• a base substrate, comprising a display region and a bonding region located on at least one side of the display region;
• a plurality of sub-pixels, located in the display region;
• a plurality of data lines, located in the display region and configured to provide data signals to the plurality of sub-pixels;
• a plurality of data leads, located in the bonding region and electrically connected with the plurality of data lines;
• at least one group of contact pads, located in the bonding region, wherein the at least one group of contact pads comprise a plurality of contact pads, at least one of the plurality of contact pads comprises a first contact pad metal layer and a second contact pad metal layer, the first contact pad metal layer is located on a side of the plurality of data leads away from the base substrate and is electrically connected with one of the plurality of data leads, the second contact pad metal layer is located on a side of the first contact pad metal layer away from the base substrate and is electrically connected with the first contact pad metal layer, and the second contact pad metal layer covers an edge of the first contact pad metal layer;
• a first insulation layer, located in the bonding region, wherein the first insulation layer is located in gaps between the plurality of contact pads and covers edges of the plurality of contact pads, and exposes surfaces of the plurality of contact pads facing away from the base substrate;
• and
• a bonding region insulation layer, located in the bonding region, and a portion of the bonding region insulation layer is located between the first contact pad metal layer and the plurality of data leads, wherein the bonding region insulation layer continuously extends from a position between the first contact pad metal layer and the plurality of data leads to a position between the first insulation layer and the base substrate.