The invention relates to a marble composite board background wall and a process for paving thereof. The marble composite board background wall comprises a connecting assembly fixedly connected with an outer wall and a marble composite board connected to the connecting assembly. The connecting assembly comprises two longitudinal parts vertically arranged at intervals, a first transverse part and a second transverse part, wherein the first transverse part and the second transverse part are arranged at intervals, and the two ends of the first transverse part and the second transverse part are inserted in the longitudinal parts. The first transverse part is provided with a first hook part and the second transverse part has magnetism. The marble composite board comprises a panel, a middle plate and a base plate which are sequentially laminated. The panel is aligned with the panel. The middle plate, the panel and the base plate are staggered. The upper portion of the base plate is provided with a hook hung on the first transverse part, and the lower portion of the base plate is provided with a magnetic part adsorbed to the second transverse part. A background wall paved by using the marble composite board background wall through the paving process not only is simple and practical in paving process, can be operated by an ordinary technicians and is high in flatness, but also enables the marble composite board not to be damaged easily, and is environmentally friendly and practical and saves time and labor.