The　robust　material　tunability　of　the　hybrid　organic-inorganic　perovskite　(HOIP)　has　attracted　considerable　research　interests　to　explore　the　application　in　photoelectronic　devices.　Huge　hysteresis　has　been　recognised　as　a　main　problem　in　HOIP-based　photoelectric　devices;　the　origin　of　hysteresis　has　been　attributed　to　the　ion　migration　and　trap　states　in　HOIP　materials.　In　this　study,　we　designed　and　synthesised　a　HOIP　single　crystal　with　one-dimensional　structure　where　the　PbI42-　octahedron　is　caged　by　the　organic　chains.　The　ion　migration　can　be　dramatically　suppressed　by　the　quantum　size　effect.　Besides,　in　the　single　crystal　trap　states　density　is　ultra-low　due　to　the　absence　of　grain　boundaries.　As　a　result,　photodetectors　based　on　this　1D　HOIP　single　crystal　show　negligible　hysteresis　I-V　curves.　Moreover,　a　high　quality　ohmic　contact　is　formed　between　electrodes　and　1D　HOIP,　which　is　beneficial　for　photocarrier　extraction.　A　responsivity　of　80　mA　W-1　and　EQE　of　30%　are　realised.　The　response　speed　is　determined　to　be　less　than　0.4　ms.　In　addition,　the　photodetectors　based　on　the　novel　1D　single　crystal　present　good　stability;　after　3　months　of　ambient　storage,　85%　of　its　original　photocurrent　generation　ability　is　retained.