Let ${\mathfrak{g}}$ be the Witt algebra over an algebraically closed field of characteristic $p>3$, and $r\in\mathbb{Z}_{\geqslant 2}$. The commuting variety ${{\cal{C}}_{r}}\left( \mathfrak{g} \right)$ of $r$-tuples over ${\mathfrak{g}}$ is defined as the collection of all $r$-tuples of pairwise commuting elements in ${\mathfrak{g}}$. In contrast with Ngo’s work in 2014, for the case of classical Lie algebras, we show that the variety ${{\cal{C}}_{r}}\left( \mathfrak{g} \right)$ is reducible, and there are a total of $\frac{p-1}{2}$ irreducible components. Moreover, the variety $ {{\cal{C}}_{r}}\left( \mathfrak{g} \right) $ is not equidimensional. All irreducible components and their dimensions are precisely determined. In particular, the variety ${{\cal{C}}_{r}}\left( \mathfrak{g} \right)$ is neither normal nor Cohen-Macaulay. These results are different from those for the case of classical Lie algebra, $\mathfrak{sl}_2$.