Circuit board and light-emitting substrate

A circuit board, comprising:

• a substrate;
• a conductive layer disposed on a side of the substrate, wherein
• the conductive layer comprises:
• at least one first metal layer;
• and
• at least one second metal layer, wherein the at least one second metal layer and the at least one first metal layer are stacked, wherein
• the at least one first metal layer is plural in number, and the at least one second metal layer is plural in number;
• at least one of the plural second metal layers is located between two first metal layers, and at least one of the plural first metal layers is located between two second metal layers;
• and
• a sum of thicknesses of the first metal layers accounts for 70% to 99% of a thickness of the conductive layer.