A stacked package structure has a metal casing, a stacked chipset, an encapsulation and a redistribution layer. The stacked chipset is adhered in the metal casing. The encapsulation is formed in the metal casing to encapsulate the stacked chip set, but a plurality of surfaces of the metal pads are exposed through the encapsulation. The redistribution layer is further formed on the encapsulation and electrically connects to the metal pads of the stacked chipset. Therefore, the stacked package structure includes the metal casing, so an efficiency of heat dissipation and structural strength are increased.