In this paper, we compute explicitly the reproducing kernel of the space of homogeneous polynomials of degree $n$ and Dunkl polyharmonic of degree $m$, i.e. ${\Delta }_k^{m}u=0$, $m\in \mathbb{N}\setminus \left\{0\right\}$, where ${\Delta }_k$ is the Dunkl Laplacian and we study the convergence of the orthogonal series of Dunkl polyharmonic homogeneous polynomials.