Hakea marginata is an erect, rounded to spreading shrub that typically grows to a height of and does not form a lignotuber. It blooms from August to October and produces sweet scented white or creamy yellow flowers in clusters in leaf axils in upper branchlets. The stiff flat leaves are narrowly elliptic to narrowly obovate long by wide ending in a sharp point. The marginal and central veins are a prominent yellow.