A semiconductor package structure includes at least one semiconductor die, at least one conductive pillar, an encapsulant and a circuit structure. The semiconductor die has an active surface. The conductive pillar is disposed adjacent to the active surface of the semiconductor die. The encapsulant covers the semiconductor die and the conductive pillar. The encapsulant defines at least one groove adjacent to and surrounding the conductive pillar. The circuit structure is electrically connected to the conductive pillar.