We constructively prove a decomposition theorem for order bounded homogeneous orthogonally-additive polynomials on archimedean vector lattices. In this way, we constructively generalize results of Sundaresan (1991), D. Perez-Garcia, and I. Villanueva, (2005), Y. Benyamini, S. Lassalle and J. L. G. Llavona (2006), D. Carando, S. Lassalle and I. Zalduendo (2006 and 2012).