The invention belongs to the technical field of constructing material cement decorative boards, and discloses a high-strength, high-toughness and rain-resistant infrared cement heat-preserving decorative board which is good in mechanical strength, toughness, rain resistance, fire resistance, heat insulation performance, sound absorption performance, moisture resistant characteristic and far-infrared radiation capacity. In comparison with an existing cement decorative board, the bending strength of the decorative board can be improved by 1.5-3 times, the compression strength can be improved by more than 2 times, the fire resistance is improved by 10-20 times, and the rain resistance characteristic is improved by 2-5 times. A core board layer of the decorative board is composed of Portland cement, high-alumina cement, gypsum, inorganic far-infrared powder, fine aggregate, inorganic retarding agent, organic retarding agent, water reducing agent and moisture repellent, and the upper surface and the lower surface of the decorative board are respectively provided with vinylon non-woven fabric. Coal ash, black iron ore powder, sodium phosphate capable of forming ionic bonds are preferably selected as key raw material, and the moisture repellent technology is applied to filler aggregate and the surface of a hardened body. In order to improve affinity, the width-length ratio of the non-woven fabric is 0.5-0.62, the diameter of the fiber is 15-45 microns, and the surface of the decorative board is treated in an activating mode.