The present invention relates to an artificial marble comprising a base resin; and layer-separated chips containing a matrix resin and additives, all or part of said additives is present in a state forming layered-phase in said matrix resin through phase-separation by a difference of specific gravity between said additives and said matrix resin, and a method for preparing the same. In the present invention, phase-separation (layer separation) of the additives in the chip is induced by adding the additives having specific gravity different from the matrix resin constituting base of the chip to the matrix resin, and if necessary, a position of the chip in the artificial marble is controlled through high specific gravity treatment. Therefore, the present invention may provide an artificial marble having a texture close to a natural rock by embodying various effects such as pearl effect, metallic effect and 3-dimensional effect.