Photodetectors　play　a　key　role　in　many　applications,such　as　remote　sensing,night　vision,reconnaissance,　medical　imaging,thermal　imaging,and　chemical　detection.　With　the　increasing　complexity　of　photoelectric　detection　tasks,photodetectors　working　in　different　bands　are　gradually　integrated　into　broad　spectral　detection　for　the　same　scene.　Limited　by　the　volume　and　task　module　of　the　integrated　system,conventional　broad　spectral　detection　tasks　often　require　multiple　detectors　working　in　different　bands　to　perform　together,which　greatly　increases　the　complexity　of　detection　system.　Therefore,photodetector　enables　to　response　ultra-broadband　radiation(UV-　vis-IR-THz)has　gradually　become　a　subject　of　great　interest　in　recent　years.　However,there　have　been　no　reports　on　the　review　of　ultra-broadband　photodetectors　so　far.　Hence,this　review　systematically　summarizes　the　research　progresses　of　ultra-broadband　photodetectors　in　the　past　ten　years.　The　factors　affecting　the　response　performance　of　photodetectors　and　the　main　types　of　common　photodetectors　are　first　described,and　then　the　research　progress,development　status　and　challenges　are　reviewed　and　suggestions　about　the　future　research　directions　of　ultra-broadband　photodetectors　are　also　provided.