Giant　third-order　nonlinear　absorption　and　refraction　of　electrochemical　graphene　oxide　(EGO)　film　were　investigated　in　the　femtosecond　regime　using　the　single　beam　Z-scan　technique.　The　excellent　chemical　stability　of　the　EGO　film　under　high-power　illumination　up　to　400　mJ/cm(2)　is　demonstrated,　which　can　be　attributed　to　the　low　oxidation　degree　revealed　by　the　optical　and　Raman　spectroscopies.　High　and　broadband　linear　transmission　over　70%　has　been　observed　from　the　visible　to　the　infrared　range.　The　low-loss　EGO　film　with　giant　third-order　nonlinearity,　excellent　chemical　stability,　large-scale　preparation　and　flexible　integration　has　a　great　potential　for　high-power　nonlinear　optical　applications.　Published　by　AIP　Publishing.