3D　printed　continuous　carbon　fiber　reinforced　PEEK　(CCF/PEEK)　composites　have　got　much　attention　because　of　their　excellent　mechanical,　thermal　and　chemical　performance　and　the　formability　of　complex　structural　components.　However,　there　are　always　two　different　weak-bond　interfaces　limiting　the　application　of　the　composites　critically,　which　are　the　poor　interlayer　bond　and　the　weak　interface　between　carbon　fibers　and　PEEK.　A　plasma-laser　cooperatively　assisted　3D　printing　process　was　utilized　to　improve　the　bi-scale　interface.　After　optimizing,　the　interlaminar　shear　strength　can　be　improved　from　5.78　MPa　to　39.05　MPa.　After　analyzing　the　failure　mode　and　bi-scale　interfacial　bond　mechanism,　it＇s　found　that　the　laser　mainly　improves　the　interlayer　bond　and　crystallinity,　while　the　plasma　effectively　improves　the　mechanical　modulus　by　treating　the　surface　of　the　carbon　fibers　chemically　and　physically.　The　work　provides　a　really　novel　idea　for　developing　the　3D　printed　CCF/PEEK　composites　for　further　application　in　aerospace　and　automotive　industries.　©　2020　Elsevier　Ltd