Various　beneficial　properties　of　graphitic　carbon　nitride　(g-CN)　have　been　discovered　during　the　promotion　of　its　visible-light-driven　photocatalytic　activity　for　water　splitting.　These　properties　enable　g-CN　working　as　a　sensing　signal　transducer　with　multiple　output　modes.　In　this　review,　state-of-the-art　sensing　applications　of　tailored　g-CN　nanostructures　in　the　recent　years　are　presented.　Initially,　g-CN　nanoarchitectures　featuring　large　surface　areas,　abundance　of　active　sites,　and　high　dispersity　in　water　are　presented　along　with　their　preparation　methods.　Then,　sensing　applications　of　these　g-CN　nanoarchitectures　are　described　in　sequence　of　the　immobilization　of　recognition　elements;　semiconductor　and　electron　donating　properties　derive　signaling　transduction　modes,　and　efficient　approaches　for　improving　sensing　performances.　The　review　is　concluded　with　a　summary　and　some　perspectives　on　the　challenges　and　future　possibilities　of　this　research　field.