  Let $R$ be a left-symmetric conformal algebra and $Q$ be a
$\mathbb{C}[\partial]$-module. We introduce the notion of a unified product for
left-symmetric conformal algebras and apply it to construct an object
$\mathcal{H}^2_R(Q,R)$ to describe and classify all left-symmetric conformal
algebra structures on the direct sum $E=R\oplus Q$ as a
$\mathbb{C}[\partial]$-module such that $R$ is a subalgebra of $E$ up to
isomorphism whose restriction on $R$ is the identity map. Moreover, we study
$\mathcal{H}^2_R(Q,R)$ in detail when $Q$, $R$ are free as
$\mathbb{C}[\partial]$-modules and $\text{rank}Q=1$. Some special products such
as crossed product and bicrossed product are also investigated.
