Micro　light-emitting　diode　(Micro-LED)　has　the　advantages　of　high　brightness,　low　power　consumption,　and　long　life.　It　has　great　potential　and　broad　application　prospects.　Using　micro-LED　as　the　light　source　and　image　source　of　the　projection　system　can　greatly　reduce　the　size　and　power　consumption　of　the　system.　However,　the　electrical　module　and　the　optical　module　of　the　micro-LED　pico-projection　system　cannot　be　separated.　This　paper　uses　image　fiber　to　effectively　separate　the　electrical　module　and　optical　module　in　the　optical　engine,　and　designs　a　micro-LED　pico-projection　optical　engine　based　on　an　image　fiber.　This　optical　engine　is　composed　of　a　projection　lens　group,　an　image　fiber　and　a　micro-LED.　The　projection　lens　group　is　composed　of　5　spherical　lenses,　with　the　total　length　of　6.752mm　and　the　focal　length　of　2.8mm.　The　modulation　transfer　function　(MTF)　is　higher　than　0.8@32lp/mm,　and　the　distortion　is　below　2%.　The　image　fiber　adopts　a　multi-core　fiber　with　a　diameter　of　2mm　and　a　resolution　of　32lp/mm.　Finally,　the　overall　simulation　model　of　the　optical　engine　is　built　to　prove　its　feasibility.　©　2023　SPIE.