Herein the tensile properties in atmosphere and corrosion behavior in 3.5%NaCl solution of a trace Er-containing heat-resistant Al-alloy conducting wire (Al-0.08Si-0.05Er-0.05Fe, mass fraction) with a diameter of 10 mm at various temperatures were studied via Instron 3369 electronic universal testing machine, immersion test and electrochemical testing means etc. The results demonstrated that the transverse section of the wire exhibited a microstructure dominated by fine near-equiaxed grains, while the longitudinal section displayed elongated grains with high aspect ratios. In addition, significant intergranular disorientation and a low fraction of recrystallization were observed. Limited secondary phases were found neither in the cross-section nor in the longitudinal section, primarily composed of coarse Al-Fe particles and Al-Fe-Si particles, alongside finer Al-Fe-Si-Er particles. At ambient temperature, the wire demonstrated a yield strength of 113 MPa and an ultimate tensile strength of 133 MPa. Elevated tensile testing temperatures induced progressive degradation of mechanical properties. However, the yield strength loss rate remained notably lower than the theoretically predicted value at temperatures below 150 ℃, which indicates enhanced thermal stability under moderate heating conditions. Immersion tests at different temperatures revealed that pitting corrosion dominated the corrosion morphology. The corrosion behavior of the alloy changed from pitting corrosion to intergranular corrosion, and corrosion resistance declined with the increasing temperature, which may be attributed to the accelerated negative shift of the free corrosion potential of Al-matrix under thermal activation. Crucially, the incorporation of Er effectively refined both the grain structures and the dimensions of Al-Fe/Al-Fe-Si phases, thereby mitigating the localized corrosion susceptibility through microstructural homogenization.