The tribological properties and tribo-induced microstructural and chemical evolution of additive manufactured AlCoCrFeNi 2.1 eutectic high-entropy alloy (EHEA) at elevated temperatures are systematically investigated in this study. The AlCoCrFeNi 2.1 EHEA consisting of FCC/BCC eutectic lamellae was produced by direct energy deposition. There is a distinctive monotonic decline in the coefficient of friction and wear rate from 0.58 and 1.97×10 -4 mm 3 N -1 m -1 to 0.4 and 1.97×10 -5 mm 3 N -1 m -1 with increasing temperature from 25 ℃ to 1000 ℃, accompanied by the transition of surface morphologies from loose debris accumulation to full coverage of oxide layer. The chemically stratified Cr 2O 3/Al 2O 3 bilayer in the topmost region provides self-lubricating and sustained protection. Coupled with the strain accommodation capability derived from the subsurface dynamic recrystallization microstructure, both factors synergistically contribute to superior wear resistance at 1000 ℃. These findings offer valuable guidance for the future design of high-temperature wear-resistant materials.