Nanoscale　polymeric　coatings　have　been　developed　and　utilized　in　a　wide　range　of　industries　for　decades.　The　ability　for　quality　control　at　nanoscale　is　critical　to　large-scale　industrial　development.　Nondestructive　testing　(NDT)　techniques　play　vital　roles　in　structural　health　monitoring　of　the　nanocoatings　throughout　their　lifetime　stages.　In　terms　of　recent　advances　in　quality　control　of　nanocomposite　coatings,　here　we　present　and　discuss　the　commonly　used　inspection　techniques　for　ex-situ　detections,　as　well　as　the　promising　in-situ　or　inline　monitoring　methods,　with　a　focus　on　the　application　of　NDT　techniques.　Future　development　of　NDT　techniques　for　polymeric　nanocomposite　coatings　will　be　directed　toward　intelligent　and　automated　inspection　systems,　in　order　to　avoid　errors　caused　by　human　factors　and　further　improve　accuracy　and　reliability.　©　2023　Elsevier　Inc.　All　rights　reserved.