With　the　emergence　and　development　of　self-luminous　micron-pixel-sized　Micro-LED　(Micro　light-emitting　diode,　mu　LED),using　mu　LED　as　the　light　and　image　source　have　become　possible　for　ultra-compact　projection　optical　engines.　It　greatly　simplifies　the　structure　of　traditional　projection　display　optical　engines.　In　this　paper,　a　mu　LED-based　super　miniature　projection　optical　engine　is　proposed,and　a　high　image　quality　pico-projection　lens　is　designed　based　on　3.　302　mm(0.　13　in)　mu　LED　display　chip.　The　divergence　angle　of　mu　LED　display　chip　matched　with　the　pupil　of　pico-projection　lens　is　optimized　according　to　the　light　distribution　characteristics　of　mu　LED　chip,which　effectively　improves　the　light　efficiency　of　mu　LED　based　pico-projection　optical　system.　The　results　show　that　the　volume　of　the　system　is　only　18.　35　mm(3),and　the　MTF　value　of　the　center　field　of　view　of　the　projection　lens　exceeds　0.　57　at　the　cut-off　frequency.　The　mu　LED　based　pico-projection　display　optical　engine　achieves　a　good　trade-off　between　system　volume　and　image　quality,and　has　a　wide　application　prospect　in　near-　eye　display　devices　such　as　AR/VR　in　the　future.