Transparent　and　conformal　superhydrophobic　coating　with　mechanochemical　robustness　is　of　great　importance　for　various　applications,　such　as　waterproof,　self-cleaning,　and　anti-icing　for　windows　of　cars　and　buildings.　However,　it　remains　a　daunting　challenge　to　endow　the　functional　surface　with　programmable　wettability.　Herein,　we　propose　a　hierarchical　coating　consisting　of　polydimethylsiloxane　(PDMS)　nanoparticles　(NPs)　and　PDMS　microparticles　(MPs)　functional　NPs　through　a　combination　of　thermal　treatment　and　spray　treatment.　The　evaporation　of　PDMS　under　heat　treatment　is　firstly　applied　to　form　a　uniform　nanoarchitectures,　followed　by　spraying　a　mixed　P25-PDMS　dispersion　to　construct　a　protective　coating　with　enhanced　surface　roughness.　This　resulted　coating　is　conformal　and　possess　reversible　wettability　on　various　substrates.　In　virtue　of　the　light-response　property　of　P25,　the　reversible　wettability　between　superhydrophobicity　and　hydrophobicity　can　be　achieved　by　repetitive　UV-light　irradiation　and　dark　environment　storage.　Besides,　the　coating　can　maintain　superhydrophobicity　with　high　transmittance　(76%　optical　transmittance)　after　immersion　in　acid/base　solution　for　24　h　and　continuously　sand　impingement.　Furthermore,　the　coating　exhibits　mechanochemical　robustness　against　high　speed　water　jet　and　Elcometer　99　tape　peeling　test　for　30　cycles　due　to　the　high　adhesion　between　the　robust　coating　and　the　glass.　For　practical　application,　the　coating　was　demonstrated　to　have　excellent　performance　in　anti-icing,　photocatalytic　degradation　of　pollutants　and　self-cleaning.　©　2020　Elsevier　B.V.