A semiconductor package structure includes a patterned conductive layer with a front surface, a back surface, and a side surface connecting the front surface and the back surface. The semiconductor package structure further includes a first semiconductor chip on the front surface and electrically connected to the patterned conductive layer, a first encapsulant covering at least the back surface of the patterned conductive layer, and a second encapsulant covering at least the front surface of the patterned conductive layer, the side surface being covered by one of the first encapsulant and the second encapsulant.