An　organic-inorganic　semiconducting　compound　of　1-methylpiperidinium　triiodoplumbate(ii)　(MPIP),　adopting　a　one-dimensional　ABX(3)　perovskite-like　structure,　has　been　synthesized.　It　is　notable　that　MPIP　undergoes　a　structural　phase　transition　(SPT)　at　T-c　similar　or　equal　to　202　K,　as　confirmed　by　DSC　and　C-p　analyses.　Strikingly,　MPIP　exhibits　remarkable　switchable　dielectric　responses;　that　is,　the　distinct　step-like　anomalies　in　the　vicinity　of　T-c.　The　switching　between　high-dielectric　and　low-dielectric　states　makes　MPIP　a　potential　switchable　dielectric　material.　Single-crystal　structural　analysis　reveals　that　the　most　distinct　difference　between　its　high-temperature　phase　(above　T-c)　and　low-temperature　phase　(below　T-c)　is　the　order-disorder　transformation　of　a　1-methylpiperidinium　cation,　which　accounts　for　its　SPT　and　striking　dielectric　response.　Besides　this,　MPIP　shows　semiconducting　behaviour　with　an　optical　bandgap　of　similar　to　2.48　eV,　comparable　to　some　other　lead-iodide　perovskites.　The　combination　of　semiconducting　and　dielectric　attributes　provides　a　new　perspective　for　the　design　of　hybrid　perovskites　as　multifunctional　materials.