A method for forming a chip package structure is provided. The method includes forming a first redistribution structure over a first carrier substrate. The method includes bonding a chip structure to the first surface through a first conductive bump. The method includes forming a first molding layer over the first redistribution structure. The method includes removing the first carrier substrate. The method includes forming a second conductive bump over the second surface. The method includes forming a second redistribution structure over a second carrier substrate. The method includes bonding the first redistribution structure to the third surface. The method includes forming a second molding layer over the second redistribution structure. The method includes removing the second carrier substrate. The method includes removing a portion of the second redistribution structure from the fourth surface. The method includes forming a third conductive bump over the fourth surface.