The invention discloses a wear-resistance composite board of a metal machine part. An overlaying wear-resisting layer (1) is arranged on the surface of an ordinary steel plate (2); and the overlaying wear-resistant layer (1) is made of hypereutectic high-chromium alloy. The invention also discloses a repair process of the wear-resistant composite board of the metal machine part. The wear resistance of a wear-resistance plate machined by adopting the technical scheme is 12 to 18 times higher than that of low-carbon steel, 5 times higher than that of stainless steel and high manganese steel and1 time higher than that of as-caststate high ferrochrome; and simultaneously, the wear-resistant plate improves the service life of the machine part and reduces the maintenance cost, machine halt loss and the like of equipment, and the performance-price ratio of the wear-resisting plate is 2 to 4 times higher than that of other materials. Due to reasonable utilization of materials, the cost of the wear-resisting overlaying composite board is reduced by 50 percent compared with the cost of manual overlaying of the same materials. The technology can be popularized and applied in cement enterprises, so that the operating cost of the cement production enterprises is reduced greatly.