We present a comprehensive study of the electronic transport properties and first-principles calculations of ${\mathrm{Ni}}_3{\mathrm{Bi}}_2{\mathrm{Se}}_2$, a parkerite-structured compound, revealing its topological nodal-line semimetal behavior. Shubnikov-de Haas oscillations confirm the presence of Dirac-like fermions, supported by a nontrivial $\pi$-Berry phase, low effective mass ($m^{*}\sim 0.18m_e$), and a high Fermi velocity ($v_{\mathrm{F}}\sim 2.93\times {10}^5{\mathrm{ms}}^{-1}$). Weak-field magnetoconductivity exhibits a characteristic $-\ln$($B$) dependence, indicative of nodal-line features. The longitudinal resistivity fits well with the Bloch-Gruneisen-Mott model, pointing to multiple scattering mechanisms, including electron-phonon and Mott-interband. Hall effect and Boltzmann transport theory analyses suggest coexistence of electron and hole carriers. Density-functional theory calculations show a bulk band inversion between Ni-$d$ and Bi-$p$ orbitals without spin-orbit coupling, and the surface states merge into the bulk around 0.43 eV, further supporting the topologically nontrivial nature of ${\mathrm{Ni}}_3{\mathrm{Bi}}_2{\mathrm{Se}}_2$.

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• Nodal-line semimetals
• Topological materials
• First-principles calculations
• Shubnikov-de Haas effect