A combined concrete material, including: a concrete; a reinforcing bar, the reinforcing bar disposed inside the concrete; and a decorative sheet, the decorative sheet including: a flat part, a first junction, and a second junction. The concrete, the reinforcing bar, and the decorative sheet are fixed together as one whole body. The decorative sheet is disposed outside the concrete, and the inner surface of the flat part is attached to the outer surface of the concrete. The first junction and the second junction are disposed on two ends of the flat part. The inner surface of the flat part is concave and forms a dovetail slot. Neighboring decorative sheets are connected together via the first junction and the second junction, which are embedded in the concrete.