Cu2O　films　composed　of　homogeneous　core-shell　microspheres　with　multilayered　shells　consisting　of　nanoparticles,　have　been　obtained　by　a　simple,　rapid　and　one-step　chemical　bath　deposition　method　via　the　corrosive　action　of　self-produced　gluconic　acid　instead　of　a　template　at　low　temperature　(80　degrees　C).　FESEM,　TEM,　XRD　and　FTIR　studies　show　that　the　formation　of　Cu2O　films　composed　of　homogeneous　core-shell　microspheres　with　multilayered　shells　mainly　relies　on　the　corrosive　action　of　gluconic　acid　on　the　Cu2O　solid　spheres,　which　is　produced　from　the　oxidation　of　the　reductant　glucose.　The　self-produced　gluconic　acid　and　the　formation　of　corrosion　channels　in　the　microspheres　are　the　key　to　the　formation　of　the　core-shell　microstructure　in　the　range　of　pH　from　12.5　to　13.2.　The　photocatalytic　degradation　of　methyl　orange　(MO)　in　aqueous　suspension　has　been　employed　to　evaluate　the　photocatalytic　activity　of　the　core-shell　microsphere　Cu2O　films.　With　the　assistance　of　H2O2,　the　photocatalytic　properties　of　the　core-shell　microsphere　Cu2O　films　in　the　degradation　of　MO　are　excellent.