The utility model relates to a combined hollow brick made of loose earth. The utility model comprises a brick body, wherein, at least one hollow hole is arranged in the brick body. The upper end of the brick body is provided with a concave slot, and the lower end is provided with a lug boss. The left and the right sides of the brick body are respectively provided with a convex inserting slot and a concave inserting slot which are corresponding. The utility model which is a combined hollow brick made of loose earth has the advantages of simple structure, easy use, fast construction speed, and high intensity.