Hakea oldfieldii is an open, straggling shrub with upright branches and growing to a height of. The smooth, needle-shaped leaves are more or less long and wide and grow alternately. The rigid dark green leaves may be curving or straight and end in a sharp point. The branchlets are smooth and covered with a bluish green powdery film. The inflorescence consists of 8–20 white or cream-yellow flowers in a raceme in the leaf axils on a smooth stalk long. The flowers appear in profusion and have an unpleasant scent. The over-lapping flowerbracts are long, the pedicel long. The smooth, cream-white perianth long and the pistil long. The fruit are egg-shaped almost rounded, long, wide with an uneven surface, occasionally warty ending with two prominent horns about long. Flowering occurs from August to October.
This species is found in the south-west from Bunbury and Busselton to the Stirling Range growing in well-drained rocky loam or clay over ironstone in winter-wet sites.