The present invention relates to a Fe-Ni-based alloy foil having excellent resin adhesion, a manufacturing method thereof, a deposition mask, and a method for manufacturing the deposition mask, wherein the average composition is weight%, Ni: 34-46%, the balance Fe and inevitable An iron-nickel alloy foil containing impurities, wherein the alloy foil includes an oxide layer of iron and nickel on the surface, and the nickel content of the oxide layer of iron and nickel is higher than the nickel content of the average composition. This excellent iron-nickel alloy foil and the average composition in weight percent, Ni: 34-46%, the surface of the iron-nickel alloy foil surface containing the remaining Fe and unavoidable impurities, surface modification with an acid solution containing acid Provides a method for producing an iron-nickel alloy foil having excellent resin adhesion, which includes an acid treatment step, wherein the Ni content of the oxide layer is higher than the nickel composition of the iron-nickel alloy foil by the acid treatment step.
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