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This application discloses an ultra-high strength, lightweight Al-Ti-V-Cr medium-entropy alloy in the field of medium-entropy alloy materials technology. The alloy comprises, by mass percentage: Al: 24–28%; Ti: 45–50%; V: 10–14%; Cr: 10–14%; and the total content of impurity elements is ≤0.01%. This technical solution obtains a medium-entropy alloy by mixing the four elements in a certain proportion, giving it characteristics such as ultra-high strength, low density, high temperature resistance, and excellent hot workability.