  We study the zero temperature conductance and magnetoconductance of ballistic
\textit{p-n} junctions in Weyl semimetals. Electron transport is mediated by
Klein tunneling between \textit{n}- and \textit{p}- regions. The chiral anomaly
that is realized in Weyl semimetals plays a crucial role in the
magnetoconductance of the junction. With the exception of field orientations
where the angle between $\mathbf{B}$ and the junction plane is small,
magnetoconductance is positive and linear in $B$ at both weak and strong
magnetic fields. In contrast, magnetoconductance in conventional \textit{p-n}
junctions is always negative.
