The invention provides a material for a colorful concrete decorative board and a preparation method thereof; the material is composed of the following components in parts by weight: 20-80 parts of a colorful aggregate, 10-50 parts of a cementitious material, 2-40 parts of an admixture, 0.01-2 parts of a pigment, 0.1-5 parts of an additive and 0.01-2 parts of fibers. The mixture is composed of thecolorful concrete decorative board material or a colorful concrete filled colorful aggregate. The mixture is casted in a sample mold, then cured to a certain age and then cut, polished and coated witha protective agent, and thus the colorful art decorative board is formed. The production cost can be greatly reduced and the resources are effectively saved. The colorful concrete decorative board isprefabricated in a factory, can integrate thermal insulation and decoration, and has the advantages of convenient on-site assembly, fast construction, and good decorative effect.