As　an　important　parameter　of　structural　health　monitoring,　strain　can　be　an　important　indicator　for　stress　concentration　and　crack　development.　And　stress/crack　can　effectively　evaluate　the　health　status　of　the　structure.　Micro-strip　antenna　strain　sensing　technology,　as　a　passive　wireless　detection　technology,　is　of　great　significance　to　the　health　monitoring　of　high-end　equipment　bearing　structures.　In　this　work,　the　UHF　(Ultra　High　Frequency)　RFID　(Radio　Frequency　Identification)　technology　is　combined　with　the　micro-strip　antenna　technology.　And　the　micro-strip　antenna　is　used　as　the　tag　antenna　to　receive　the　energy　emitted　by　the　RFID　reader　and　activate　the　tag　chip　of　the　RFID.　Then　the　signal　modulation　technology　is　used　to　eliminate　the　noise　interference　in　the　environment,　and　the　resonant　frequency　of　the　antenna　changes　with　the　strain/crack　information　is　returned　to　the　reader　to　realize　the　passive　wireless　strain　and　crack　detection.　Through　the　experiment,　it　proves　that　under　different　strain/crack　states,　the　resonant　frequency　of　the　RFID-based　antenna　sensor　decreases　with　the　increase　of　strain　or　the　increase　of　the　depth　of　the　crack.　©　Published　under　licence　by　IOP　Publishing　Ltd.