The invention relates to a mosaic composite floor, comprising a base plate, wear-resistant paper layers, decorative paper layers and balance paper layers, wherein, the three-circumferential side walls of the base plate are provided with housing joints, the wear-resistant paper layers and the decorative paper layers are successively pressed on the surface of the base plate and the balance paper layers are pressed at the bottom of the base plate; and the decorative paper layers are formed by splicing at least two unit decorative paper layers on the same plane and each unit decorative paper layer is respectively provided with patterns. The mosaic composite floor is formed by slicing the separate unit decorative paper layers with one another on the same plane, thereby solving the problem of atransition region formed by a dark color region and a light color region of the patterns during the process of printing decorative papers so that the borders of the pattern regions formed after each unit decorative paper layer is sliced are clear and the decorative patterns on the floor have excellent visual effect; and the mosaic composite floor has the characteristic of low manufacture cost.