PURPOSE: A manufacturing method of a stone panel is provided to improve the exterior of a stone panel and to enable workers to easily carry the stone panel by lightening the stone panel. CONSTITUTION: A manufacturing method of a stone panel(500) is as follows. A reinforcing member(200) having a specific thickness is attached on one surface of a stone plate(100). The thickness of the stone plate is reduced by horizontally cutting the stone plate. A lightweight plate(300) is attached on the processed stone plate or the rear surface of the reinforcing member using adhesive. Connection units(310) are formed in both sides of the lightweight plate.
