The present invention is characterized in that a metal oxide is introduced into an alloy matrix by performing additive manufacturing (AM) using a nickel-based superalloy powder containing niobium (Nb) containing 0.005 to 0.015 wt% of oxygen as a raw material. A method for manufacturing a dispersion-strengthened niobium-containing nickel-based superalloy, and an oxide dispersion-strengthened niobium-containing nickel-based superalloy produced thereby, the present invention relates to a nickel-based superalloy containing niobium produced through additive manufacturing. By introducing oxides with a size of about 10 to 100 nm inside the crystal grains while maintaining the basic characteristics of An alloy having improved high-temperature mechanical properties and having high resistance to generation of internal cracks such as creep and fatigue can be easily and economically manufactured compared to the prior art.
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