Single-atom　catalysis　(SAC)　attracts　wide　interest　for　zinc-air　batteries　that　require　high-performance　bifunctional　electrocatalysts　for　oxygen　reactions.　However,　catalyst　design　is　still　highly　challenging　because　of　the　insufficient　driving　force　for　promoting　multiple-electron　transfer　kinetics.　Herein,　we　report　a　superstructure-assisted　SAC　on　tungsten　carbides　for　oxygen　evolution　and　reduction　reactions.　In　addition　to　the　usual　single　atomic　sites,　strikingly,　we　reveal　the　presence　of　highly　ordered　Co　superstructures　in　the　interfacial　region　with　tungsten　carbides　that　induce　internal　strain　and　promote　bifunctional　catalysis.　Theoretical　calculations　show　that　the　combined　effects　from　superstructures　and　single　atoms　strongly　reduce　the　adsorption　energy　of　intermediates　and　overpotential　of　both　oxygen　reactions.　The　catalyst　therefore　presented　impressive　bifunctional　activity　with　an　ultralow　potential　gap　of　0.623　V　and　delivered　a　high　power　density　of　188.5　mW　cm(-2)　for　assembled　zinc-air　batteries.　This　work　opens　up　new　opportunities　for　atomic　catalysis.