  Recently, a family of nonmagnetic kagome metals \textit{A}$\mathrm{V_3Sb_5}$
(\textit{A}=K, Rb, and Cs) has attracted significant attention for realizing
the intertwining of quantum order and nontrivial topology. However, these
compounds have been identified to host complex band structures. Therefore, it
is desirable to design and synthesize novel kagome materials with a simple band
topology and good transport properties. In this study, using first-principles
calculations, we present the electronic properties and the intrinsic spin Hall
effect of V$_6$Sb$_4$, the latest experimentally synthesized vanadium-based
compounds with a kagome bilayer. In the absence of spin-orbital coupling (SOC),
this compound is a Dirac nodal line semimetal with symmetry-protected nodal
rings near the Fermi level. Within the SOC, the spin-rotation symmetry breaks
the gaps of the nodal rings with a small band gap. Furthermore, based on the
Wannier tight-binding approach and the Kubo formula, we propose a large spin
Hall effect in V$_6$Sb$_4$, which intrinsically originates from the spin Berry
curvature. Our work further expands nonmagnetic kagome compounds for
applications in spintronics accompanied by exotic quantum order.
