<p>The design concept of “eutectic high-entropy alloys (EHEAs)” offers a novel approach to optimizing the mechanical properties of NiAl alloys. In this study, a series of (Ni_<i>x</i>Al)₆₃Cr₁₇V₂₀ NiAl-based EHEAs (<i>x</i> = 0.6, 0.8, 1.0, 1.2, 1.4, 1.6) were fabricated using the non-self-consumable arc melting method. The microstructures of the EHEAs transitioned from per-eutectic (<i>x</i> = 0.6, 0.8) to eutectic (<i>x</i> = 1.0) and subsequently to sub-eutectic (<i>x</i> = 1.2, 1.4, 1.6) as the Ni/Al ratio increased. An increase in the Ni/Al ratio promotes the formation of the B2 phase and enhances the alloy's room-temperature strength. Strengthening from the B2 phase and grain boundaries are the primary factors influencing the alloy's mechanical properties. (Ni_<b>1.2</b>Al)₆₃Cr₁₇V₂₀ EHEAs exhibit the best comprehensive mechanical properties, with a yield strength of 1613.67&#xa0;MPa, a compressive strength of 3137.34&#xa0;MPa, and a fracture strain of 27.95%, outperforming those of Ni10 EHEAs with a fully eutectic structure. When the Ni/Al ratio <i>x</i> ranges from 0.6 to 1.8, the alloy's yield strength follows the relationship <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\({\sigma }_{0.2}=102.15\times {e}^{x/0.86}+1161.74\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msub> <mi>σ</mi> <mrow> <mn>0.2</mn> </mrow> </msub> <mo>=</mo> <mn>102.15</mn> <mo>×</mo> <msup> <mrow> <mi>e</mi> </mrow> <mrow> <mi>x</mi> <mo stretchy="false">/</mo> <mn>0.86</mn> </mrow> </msup> <mo>+</mo> <mn>1161.74</mn> </mrow> </math></EquationSource> </InlineEquation>, which can serve as a foundation for designing target alloys based on the service conditions of components.</p>