Andersonia brevifolia is an erect shrub with many branches and that typically grows to a height of up to. Its leaves are overlapping, usually pressed against the stem, egg-shaped, long and wide. The flowers have 10 to 15 leaf-like bracteoles on their stalks. The sepals are linear, long and usually hairy. The petals are white or pink, about as long as the sepals, with lobes slightly shorter than the petal tube. The stamens are about the same length or slightly longer than the petal tube, the anthers usually more than half the length of the filaments.