Acacia kochii is a shrub belonging to the genus Acacia and the subgenus Phyllodineae.
The spreading, spiny and intricate shrub typically grows to a height of 0.5to. It has glabrous branches with long thorns. It has clusters of phyllodes found in the nodes. The phyllodes have an asymmetrically narrowly oblong-elliptic to narrowly oblanceolate shape with a length of and a width of .[1] It produces yellow flowers in August. The simple inflorescences occur singly or in groups of two or three. The flower-heads are shortly cylindrical or have an ovoid shape with a length of and a diameter of with golden flowers. The seed pods that form after flowering resemble a sting of beads with a length of up to and a width of . The dull black seeds in the pods have an elliptic shape.[1]
It is native to an area in the Wheatbelt and Goldfields-Esperance regions of Western Australia between Yalgoo in the north to Moora in the south growing in clay or loamy-sandy soils.