The　reversible　photochromic　molecule　azobenzene　was　encapsulated　into　pores　of　metal　organic　frameworks　(MOFs)　using　a　modified　liquid-phase　epitaxial　layer-by-layer　method　successfully.　The　obtained　thin　film　not　only　has　an　oriented,　homogeneous　film　with　effective　guest　encapsulation　but　also　has　an　isomerization　between　trans-and　cis-azobenzene　in　MOF　pores　under　UV　and　visible　light　irradiation.　Furthermore,　the　photoluminescent　property　was　studied　for　azobenzene　loaded　HKUST-1　thin　film　with　different　temperature.　This　facile　preparation　strategy　and　optical　property　of　photochromic　guest　encapsulation　into　porous　MOF　thin　film　will　provide　the　development.　of　new　optical　thin　film　materials　possessing　photoswitching　and　photoluminescent　properties.