In　this　study,　we　propose　a　simpler　method　to　fabricate　single-layer　polymer　cholesteric　films　with　reflective　bandwidth　over　1500　nm　instead　of　the　previous　multilayer　films.　We　add　polymerizable　chiral　compounds　and　non-polymerizable　chiral　compounds　with　the　same　rotation　direction　into　the　liquid　crystal　mixing　system.　Due　to　the　presence　of　photoinitiators　and　UV-absorbing　dyes,　when　UV　light　irradiates　the　polymerization,　the　polymerizable　monomers,　including　the　polymerizable　chiral　compounds,　are　rapidly　polymerized　in　the　nearlight　side,　and　the　non-polymerizable　monomers,　including　the　non-polymerizable　chiral　compounds　and　partial　monoacrylate　monomers,　do　diffusion　movement　towards　the　far-light　side,　and　after　the　anchoring　action　of　the　polymer　network,　the　formation　of　the　small-large-small　pitch　gradient　distribution　is　realized,　which　results　in　the　broadband　reflection.　In　the　paper,　the　effect　of　multiple　factors　on　the　reflection　broadband　of　the　film　is　explored,　and　the　polymer-stabilized　cholesteric　liquid　crystal　(PSCLC)　film　with　a　reflection　bandwidth　of　1572　nm　is　successfully　prepared,　which　is　demonstrated　to　have　many　desirable　properties,　including　thinness　and　flexibility.　The　flexible　CLC　films　reported　in　this　study　are　expected　to　be　promising　prospects　for　several　applications　such　as　shielding　infrared　devices,　energy-efficient　windows　for　automobiles,　and　modern　building　facades.