The invention relates to a wall-like brick high-molecular hard wall decorative material, comprising a base material, a printing mask and a polyester coating layer, wherein the base material and the printing mask are laminated together by hot pressing, and the polyester coating layer is coated as a net on the surface of the printing mask. A preparation method of the wall-like brick high-molecular hard wall decorative material comprises the following steps: 1, preparing the base material; 2, preparing the printing mask; 3, printing a mask; 4, performing hot-pressing lamination; 5, performing net coating of polyester; 6, curing; and 7, performing mould pressing cutting. The wall-like brick high-molecular hard wall decorative material provided by the invention has the advantages of avoiding mildew, having fire resistance, and being high in strength, hardness, degree of finish, brightness, and simulation view; and the preparation method has the advantages of being low in production cost, high in quality of products, and high in assembly line output.