Optical　hiding　schemes　based　on　visual　cryptography　usually　hide　secret　information　in　multiple　visual　keys.　However,　the　traditional　visual　keys　are　usually　Mosaic　patterns,　which　are　easy　to　attract　the　attention　of　attackers,　and　limit　their　randomness　and　security.　And　each　visual　key　needs　a　corresponding　transport　carrier,　leading　to　limited　hiding　capacity.　To　solve　these　problems,　this　paper　proposes　an　optical　information　hiding　method　based　on　speckle　encoding　and　dual-multiplexing　interferometry.　This　method　uses　natural　speckle　with　high　randomness　to　partial　replace　traditional　visual　keys,　realizing　the　combination　application　of　natural　speckle　keys　and　artificial　visual　keys.　The　optical　properties　of　wavelength　and　diffraction　distance　multiplexing　interference　can　hide　multiple　visual　keys　in　a　single　image,　which　improves　the　hiding　capacity.　Simulation　and　optical　experiments　show　that　the　proposed　method　has　high　security,　large　hiding　capacity,　imperceptibility　and　robustness.