Exploring　efficient　and　cost-effective　catalysts　to　replace　precious　metal　catalysts,　such　as　Pt,　for　electrocatalytic　oxygen　reduction　reaction　(ORR)　and　hydrogen　evolution　reaction　(HER)　holds　great　promise　for　renewable　energy　technologies.　Herein,　we　prepare　a　type　of　Co　catalyst　with　single-atomic　Co　sites　embedded　in　hierarchically　ordered　porous　N-doped　carbon　(Co-SAS/HOPNC)　through　a　facile　dual-template　cooperative　pyrolysis　approach.　The　desirable　combination　of　highly　dispersed　isolated　atomic　Co-N-4　active　sites,　large　surface　area,　high　porosity,　and　good　conductivity　gives　rise　to　an　excellent　catalytic　performance.　The　catalyst　exhibits　outstanding　performance　for　ORR　in　alkaline　medium　with　a　half-wave　potential　(E-1/2)　of　0.892　V,　which　is　53　mV　more　positive　than　that　of　Pt/C,　as　well　as　a　high　tolerance　of　methanol　and　great　stability.　The　catalyst　also　shows　a　remarkable　catalytic　performance　for　HER　with　distinctly　high　turnover　frequencies　of　0.41　and　3.8　s(-1)　at　an　overpotential　of　100　and　200　mV,　respectively,　together　with　a　long-term　durability　in　acidic　condition.　Experiments　and　density　functional　theory　(DFT)　calculations　reveal　that　the　atomically　isolated　single　Co　sites　and　the　structural　advantages　of　the　unique　3D　hierarchical　porous　architecture　synergistically　contribute　to　the　high　catalytic　activity.