In　this　work,　the　surface　of　long-period　fiber　grating　(LPFG)　and　polarization　maintaining　fiber　(PMF)　is　functionalized　based　on　the　interaction　between　the　resonance　wavelength　and　external　environment.　LPFG　coated　with　a　150　nm　ZnSe/Co　film　is　fixed　on　a　hollow　bracket,　prestressed,　and　annealed　many　times.　A　highly　sensitive　liquid　level　sensor　with　adjustable　sensitivity,　an　adjustable　measurement　range,　and　a　high　liquid　level　early　warning　is　prepared.　The　waveguide　layer　controlled　by　humidity　is　constructed　by　filling　poly(3,4-ethylenedioxythiophene)/poly(styrene　sulfonate)　(PEDOT/PSS)　in　a　periodically　etched　PMF.　The　surface　is　coated　with　a　poly(vinyl　alcohol)　(PVA)　and　carbon　nanotube　(CNT)　composite　polymer.　After　laser　processing,　a　honeycomb　porous　film　is　obtained,　and　the　humidity　sensor　with　wavelength　modulation　is　prepared.　The　pH-sensitive　polymer　is　successively　adsorbed　on　the　surface　of　PMF　coated　with　a　120　nm　indium　tin　oxide　(ITO)　film　by　electrostatic　self-assembly　(ESA).　Poly(allylamine　hydrochloride)　(PAH),　poly(acrylic　acid)　(PAA),　and　poly(styrene　sulfonate)　(PSS)　constitute　a　composite　film　with　rapid　deposition　and　high　permeability　that　is　covered　with　polyaniline/poly(methyl　methacrylate)　(PMMA)　as　the　protective　layer.　After　laser　processing,　a　fluffy　porous　film　structure　is　formed.　The　pH　sensor　is　obtained　and　the　preparation　steps　are　greatly　reduced.　Finally,　based　on　the　wavelength　division　multiplexing　(WDM)　and　multiwavelength　matrix　(MWM),　the　problem　of　crosstalk　is　solved.　An　integrated　sensor　is　constructed　to　realize　the　simultaneous　measurement　of　temperature,　liquid　level,　humidity,　and　pH.　It　has　been　successfully　applied　to　monitor　the　overall　environment　of　a　chemical　waste　liquid　storage　tank.　The　sensor　has　the　advantages　of　remote　monitoring,　safety,　efficiency,　and　labor-saving.　©　2022　American　Chemical　Society.