The invention discloses a bearing substrate and a manufacturing method thereof. The bearing substrate comprises a
dielectric layer, a first line layer, an insulating layer, a plurality of conductive blocks and a first conductive structure. The
dielectric layer has a first surface, a second surface and a plurality of blind holes. The first line layer is internally buried in the first surface, and the blind holes extend to the first line layer from the second surface. The insulating layer is arranged on the first surface and is provided with a third surface, a fourth surface and a plurality of first open holes. The first open holes
expose the first line layer, and the
diameter of each first
open hole increases gradually from the third surface to the fourth surface. The conductive blocks are filled in the conductive blocks and are connected with the first line layer. The first conductive structure comprises a plurality of conductive holes filling to the blind holes and second line
layers arranged on a part of the second surface.