The invention relates to a surface treatment process of wall decorative board, which takes one of the fiber-reinforced calcium silicate board, fiber cement board, fiberglass magnesium oxide board or the like as a substrate, firstly coats an UV coating on the surface of the substrate, and performs dust exhaustion and sanding to the cured surface; re-coating PU or UV white bottom; and then performsdust exhaustion and sanding to the surface; and then coats PU or UV glue again on the surface, uses low-temperature heat-transferring technology to transfer the pattern on the heat-transferring die to the surface; finally, coats a UV protective coating on the surface of the transferred pattern. This wall decorative board has high-grade, wear-resistance, anti-aging, non-susceptibility to contamination, good fire prevention and waterproof performance.