  The Lie conformal algebra of loop Virasoro algebra, denoted by
$\mathscr{CW}$, is introduced in this paper. Explicitly, $\mathscr{CW}$ is a
Lie conformal algebra with $\mathbb{C}[\partial]$-basis
$\{L_i\,|\,i\in\mathbb{C}\}$ and $\lambda$-brackets $[L_i\, {}_\lambda \,
L_j]=(-\partial-2\lambda) L_{i+j}$. Then conformal derivations of
$\mathscr{CW}$ are determined. Finally, rank one conformal modules and
$\mathbb{Z}$-graded free intermediate series modules over $\mathscr{CW}$ are
classified.
