To provide a method for preparing a lightweight stone grain incombustible tile which can be easily formed by using an inorg. phenol resin foamed sheet material mixed with a glass fiber with an arbitrary shape and dimension as a base material and has the same brightness and deep feeling as those of a stone grain and is lightweight, incombustible and easily processable and has good weatherability.

An inorg. phenol resin foamed sheet material mixed with a glass fiber formed into an arbitrary shape and dimension is used as a base material and a coating consisting of a compsn. wherein ceramic fine hollow particles with a hydraulic pressure resistance of at least 600kgf/cm2 and natural crushed stone particles are added into a filler of a coating film waterproof material consisting of a synthetic resin emulsion is applied on the surface. In addition, on the back surface of the base material, a narrow hooking projected piece or a narrow hooking channel for fixing processing is formed.