A method for combining a foam with a reinforced core comprising following steps of: adopting a reinforced core, the reinforced core having a thin sheet and a plurality of perforations penetrating through the sheet respectively, adopting a mold, the mold having at least two mold plates (32, 33), the mold plates (32, 33) moving relatively to each other between a mold clamping position and a mold opening position under an action of external force, when the mold plates (32, 33) being located at the mold clamping position, defining a mold chamber with a closed space between the mold plates (32, 33), locating the reinforced core in the space of the mold chamber, separating one sheet surface and another sheet surface on two opposite sides of the reinforced core from chamber walls on two sides of the mold chamber facing the two sheet surfaces (211, 212) respectively, and filling a rated molten polymer raw material containing a foaming agent at least into a part of the space of the mold chamber and hole spaces of the perforations to be foamed and molded in the mold chamber, wherein a part of the space of the mold chamber refers to a space between the sheet surface on one of the sides of the reinforced core and the chamber wall on one of the sides of the mold chamber facing the sheet surface, wherein the mold further comprises a plurality of first position protruding points formed by protruding from the chamber wall in the mold chamber in an opposite direction of gravity, and the reinforced core is placed on free ends of the first position protruding points to ensure a distance between the reinforced core and the chamber wall of the mold chamber, characterized in that a plurality of second position protruding points protrude on the chamber wall of the mold chamber on another side relative to the side with the first position protruding points, and a distance between the free ends of the first position protruding points and free ends of the second position protruding points is equal to a thickness of a sheet of the reinforced core, so that the reinforced core can be sandwiched and fixed between the first position protruding points and the second position protruding points. adopting a reinforced core, the reinforced core having a thin sheet and a plurality of perforations penetrating through the sheet respectively, adopting a mold, the mold having at least two mold plates (32, 33), the mold plates (32, 33) moving relatively to each other between a mold clamping position and a mold opening position under an action of external force, when the mold plates (32, 33) being located at the mold clamping position, defining a mold chamber with a closed space between the mold plates (32, 33), locating the reinforced core in the space of the mold chamber, separating one sheet surface and another sheet surface on two opposite sides of the reinforced core from chamber walls on two sides of the mold chamber facing the two sheet surfaces (211, 212) respectively, and filling a rated molten polymer raw material containing a foaming agent at least into a part of the space of the mold chamber and hole spaces of the perforations to be foamed and molded in the mold chamber, wherein a part of the space of the mold chamber refers to a space between the sheet surface on one of the sides of the reinforced core and the chamber wall on one of the sides of the mold chamber facing the sheet surface, wherein the mold further comprises a plurality of first position protruding points formed by protruding from the chamber wall in the mold chamber in an opposite direction of gravity, and the reinforced core is placed on free ends of the first position protruding points to ensure a distance between the reinforced core and the chamber wall of the mold chamber, characterized in that a plurality of second position protruding points protrude on the chamber wall of the mold chamber on another side relative to the side with the first position protruding points, and a distance between the free ends of the first position protruding points and free ends of the second position protruding points is equal to a thickness of a sheet of the reinforced core, so that the reinforced core can be sandwiched and fixed between the first position protruding points and the second position protruding points.