Food　packaging　plays　a　vital　role　in　the　food　supply　chain　by　acting　as　an　additional　layer　to　protect　against　food　contamination,　but　the　main　function　of　traditional　conventional　packaging　is　only　to　isolate　food　from　the　outside　environment,　and　cannot　provide　related　information　about　food　spoilage.　Intelligent　packaging　can　feel,　inspect,　and　record　external　or　internal　changes　in　food　products　to　provide　further　information　about　food　quality.　Importantly,　intelligent　packaging　indicators　will　account　for　a　significant　proportion　of　the　food　industry’s　production,　with　promising　application　potential.　In　this　review,　we　mainly　summarize　and　review　the　upcoming　progress　in　the　classification,　preparation,　and　application　of　food　packaging　indicators.　Equally,　the　feasibility　of　3D　printing　in　the　preparation　of　intelligent　food　packaging　indicators　is　also　discussed　in　detail,　as　well　as　the　limitations　and　future　directions　of　smart　food　packaging.　Taken　together,　the　information　supported　in　this　paper　provides　new　insights　into　monitoring　food　spoilage　and　food　quality.　©　2022　by　the　authors.　Licensee　MDPI,　Basel,　Switzerland.