Conothamnus aureus is a spindly, straggly shrub with many branchlets, which grows to high and wide. The leaves are lance-shaped to egg-shaped, about long, wide and hairy with a single vein. The flowers are golden yellow and arranged on the ends of branchlets in spherical heads about in diameter. Its flowers differ from those in the other two species of Conothamnus in that its flowers lack petals. Flowering occurs between August and November.