Broadband　photodetectors　are　of　great　significance　in　a　wide　variety　of　technologically　important　areas.　Inspired　by　bionics,　insect　cornea-mimicking　microstructures　could　reduce　surface　reflection,　thus　enabling　broadband　detection.　Here,　we　fabricate　a　broadband　large-area　(1280　x　1024)　HgCdTe　focal　plane　array　photodetector　based　on　biomimetic　ZnS　microarrays,　which　achieves　high　external　quantum　efficiency　(＞　60%,　averaging　79%)　across　the　broad　wavelength　range　of　400　nm-　5000　nm.　These　results　demonstrate　that　implementing　biomimetic　ZnS　microstructures　has　effectively　broadened　the　operational　wavelength　range　of　conventional　HgCdTe　infrared　photodetectors　to　encompass　the　visible　light　spectrum.　Our　work　achieves　continuous　visible-to-infrared　spectral　imaging　and　provides　a　beneficial　route　to　fabricate　broadband,　large-area,　high-performance　photodetectors.