Inorganic-organic　hybrid　materials　have　been　used　as　a　promising　material　for　high-efficiency　solar　cells　and　light-emitting　diodes.　Here,　we　fabricated　a　multilayer　perovskite　film　CH3NH3PbBr3@CH3NH3PbI3　(MAPbBr(3)@MAPbI(3))　with　a　sandwich　structure　by　means　of　thermal　evaporation　of　MAPbBr(3)　and　MAPbI(3)　single　crystals　on　glass　substrates.　The　MAPbBr(3)@MAPbI(3)　film　with　the　sandwich　structure,　which　consists　of　a　MAPbBr(3)　bottom　layer,　a　MAPbI(3-x)Br(x)　interlayer,　and　a　MAPbI(3)　top　layer,　exhibits　gradient　band　gap　and　multiple　photoluminescence　peaks.　The　gradient　band　gap　can　be　controllably　turned　to　cover　almost　the　entire　visible　spectrum.　Adjusting　the　mass　ratio　of　MAPbI(3)/MAPbBr(3)　can　transform　the　MAPbBr(3)@MAPbI(3)　film　from　a　Br　rich　phase　to　an　I　rich　phase,　and　in　this　way,　the　PL　emission　peaks　gradually　shift　from　the　blue　region　(543　nm)　to　the　red　region　(822　nm),　respectively.　The　property　of　tunable　multiple　photoluminescence　peaks　has　application　potential　in　white　light-emitting　diodes.　The　gradient　band　gap　perovskites　may　be　used　in　colorful　or　tandem　structure　solar　cells.　We　believe　that　the　sandwich　structure　of　the　multilayer　perovskite　film　will　facilitate　the　design　and　development　of　more　perovskite-based　devices.