A　new　kind　of　WC-based　coating　with　superhard　WCoB　compound　as　the　binder　was　fabricated　by　the　high　velocity　oxy-fuel　spraying　of　WC-WB-Co　powder.　The　microstructure,　mechanical　and　tribological　properties　of　the　WC-WCoB　coating　were　investigated,　together　with　those　of　the　conventional　WC-Co　coating　for　comparison.　The　results　demonstrated　that　the　WC-WCoB　coating　has　simultaneously　improved　hardness　and　fracture　toughness,　and　thus　remarkably　decreased　wear　rate　as　compared　to　the　conventional　coating.　The　enhanced　tribological　properties　of　the　WC-WCoB　coating　are　attributed　to　the　low　plastic　deformation　and　the　resultant　inhibition　of　the　micro-ploughing　wear　and　the　increased　fracture　toughness　and　interfacial　bonding,　which　can　reduce　the　amount　of　large　cracks.　Moreover,　the　high　intrinsic　hardness　of　WC　and　WCoB,　as　well　as　their　good　interfacial　bonding,　are　more　effective　in　resisting　against　wear　as　compared　with　the　conventional　coating.