Conventional　forward　design　strategies　for　broadband　achromatic　metalens　usually　suffer　from　exact　physical　knowledge　and　high　fabrication　requirements　of　complicated　meta-atoms　structures.　Recently,　the　inverse　design　aims　at　automatically　optimizing　meta-optics　design　but　has　been　currently　limited　by　expensive　brute-force　numerical　solvers　and　complex　structures.　Therefore,　it　is　essential　to　develop　a　time-efficient　design　method　that　meets　the　requirements　of　high-performance　metalens　while　maintaining　structural　simplicity.　Meanwhile,　there　are　relatively　few　researches　in　the　field　of　mid-infrared　meta-optics　which　possesses　extensive　application　potential.　In　this　work,　we　propose　an　end-to-end　inverse　design　strategy　for　designing　mid-infrared　broadband　achromatic　polarization-insensitive　metalenses　utilizing　elliptical　meta-atoms.　The　framework　comprises　a　high-performance　forward　prediction　network　as　a　fast　approximate　solver　and　a　global　multi-objective　optimization　model　to　achieve　an　end-to-end　design.　As　a　proof,　we　designed　a　broadband　achromatic　and　polarizations-insensitive　metalens　operating　at　4–5　μm　using　elliptical　meta-atoms　with　only　two　design　degrees　of　freedom.　The　average　focusing　efficiency　is　61.37%　with　a　maximum　focal　length　shift　of　only　3.56%.　The　numerical　aperture　(NA)　of　the　proposed　broadband　achromatic　metalens　is　0.178.　It　is　worth　mentioning　that　by　using　this　framework,　we　can　utilize　elliptic　meta-atom　with　structural　asymmetry　to　achieve　polarization-insensitive　properties.　The　structure　of　meta-atoms　is　simple　and　easy　to　fabricate,　achieving　a　balance　between　complex　functions,　high　efficiency　and　simple　fabrication　process.　Our　framework　provides　new　opportunities　for　avoiding　complicated　physical　models　and　enabling　the　integration　of　complex　functionalities　into　a　single　metalens,　thereby　driving　intelligent　design　of　efficient　and　emerging　mid-infrared　meta-devices.　©　2025