The utility model discloses a heat-resistant aluminum alloy conductor for an ultrahigh-voltage direct-current circuit with a grounding electrode, which is selectively used as a conductor in the ultrahigh-voltage direct-current circuit with the grounding electrode. Conductors are divided into two groups to be symmetrically arranged on two sides of a tower, sub-conductors on each side are horizontally arranged with spacing distances of 450mm, metal tools such as wire clips, isolation rods, dampers and the like which are used with the conductors are metal tools for heat-resistant conductors, and high temperature is set at 80 DEG C during positioning of the circuit. The circuit with the grounding electrode adopts the heat-resistant aluminum alloy conductor, so that running requirements of the ultrahigh-voltage direct-current circuit with the grounding electrode are met, requirements on load of an iron tower and service cost of the conductor are further lowered, and engineering cost is saved.