The　existing　Hash　functions　based　on　quantum　walk　construction　are　all　proposed　under　the　ideal　closed　environment.　In　order　to　better　conform　to　the　actual　situation　and　improve　the　relevant　performance　of　Hash　functions,　we　propose　a　quantum　hash　function　constructed　by　continuous　quantum　walk　on　the　basis　of　broken-line　noise　model.　We　first　propose　a　continuous-time　quantum　walk　model　on　cycle　under　the　influence　of　broken-line　decoherence,　after　that　apply　this　model　to　the　construction　process　of　the　quantum　hash　function,　and　put　forward　a　building　method　of　the　hash　function　on　the　basis　of　the　broken-line　decoherent　continuous-time　quantum　walk　on　the　one-dimensional　cycle.　The　safety　analysis　and　numerical　simulation　indicate　that　our　hash　function　has　greater　anti-collision　performance　than　the　existing　hash　function　based　on　the　quantum　walk.　©　2023　SPIE.