Printed circuit board and electronic device

The invention provides a printed circuit board and an electronic device. The printed circuit board comprises a first daughter board, a bonding layer and a second daughter board which are sequentially arranged in a stacked mode in the first direction. The first daughter board is provided with a filling hole, in the first direction, the length of the filling hole is equal to the thickness of the first daughter board, and a heat conduction piece is arranged in the filling hole and connected with the bonding layer; a conductive pattern is arranged on the surface, away from the second daughter board, of the first daughter board, and at least part of the conductive pattern covers one end, away from the bonding layer, of the heat conducting part; the second daughter board is provided with a plurality of heat dissipation holes, in the first direction, the length of the heat dissipation holes is equal to the thickness of the second daughter board, and at least part of the heat dissipation holes are connected with the