The present invention relates to a sandwich panel for a building material. The sandwich panel for a building material comprises: a partition member; left and right lateral wall members whose each one end is equipped to be fixated to one end and the other end of the partition member; a compressive strength reinforcement member equipped to reinforce a compressive strength by fixating one end to one surface of the partition member; a heat insulating member equipped as one end is fixated to the other surface of the partition member; upper and lower lateral wall members equipped to protect the compressive strength reinforcement member and the heat insulating member as each of both ends is supported by the upper end and the lower end of the left and right lateral wall members; a front plate equipped to allow a sandwich panel for a building material to form a front as a bent part is fixated to the left and right lateral wall members and the upper and lower lateral wall members while both ends and the upper and lower ends are formed as a bent plate to block and protect the compressive strength reinforcement member; and a rear plate equipped to allow the sandwich panel for a building material to form the front as a bent part, fixated to the left and right lateral wall members and the upper and lower lateral wall members while both ends and the upper and lower ends are formed as a bent plate to block and protect the heat insulating member.