Topological　superconductors　(TSCs)　are　an　ideal　platform　for　realizing　Majorana　fermions　to　implement　fault-tolerant　topological　quantum　computation.　However,　the　low　transition　temperature　(Tc)　of　TSCs　hinders　experimental　measurements　and　practical　applications.　Here,　we　propose　that　metal-bonded　perovskite　Ag4H　is　a　TSC,　characterized　by　nontrivial　topological　surface　states,　a　bulk　s-wave　superconducting　gap,　and　a　Tc　reaching　up　to　63　K　at　ambient　pressure.　The　structural　stability,　synthesis　routes,　band　topology,　and　superconductivity　are　well　investigated　by　first-principles　calculations,　Wannier　interpolation　method,　effective　k　·　p　model,　and　Migdal-Eliashberg　theory.　The　ambient-pressure　phase　Ag4H　can　be　realized　through　kinetic　processes　of　cooling　and　depressurization　from　its　pressure　state.　Topological　nodal　lines　and　Dirac　points　with　nontrivial　Z2　index　are　identified　in　Ag4H.　Our　in-depth　analysis　reveals　an　unconventional　band　inversion　mechanism,　in　which　the　usually　low-lying　H-1s　band　is　inverted　partially　to　the　Fermi　level　by　intermediate　metallization　of　hydrogen　resulting　from　the　metallic　bonding　of　the　H　sublattice　with　the　Ag　matrix.　Gap　anisotropy　is　related　to　Fermi　surface　nesting　and　q-dependent　electron-phonon　coupling.　The　large　H　interstitial　space,　more　s/p　orbital　electrons　at　the　Fermi　level,　and　high　H　concentration　promote　high-temperature　superconductivity　under　ambient　pressure.　Last　but　not　least,　Ag4H　is　the　first　few-hydrogen　metal-bonded　intrinsic　Eliashberg　TSC,　exhibiting　high　Tc　near　the　liquid-nitrogen　temperature　region.　This　work　may　pave　a　different　way　to　realize　topological　superconductivity　at　higher　temperature　under　ambient　pressure.　©　2025　American　Physical　Society.