Prasophyllum goldsackii is a terrestrial, perennial, deciduous, herb with an underground tuber and a single tube-shaped leaf which is 100–300 mm (4–10 in) long and 1–2 mm (0.04–0.08 in) wide, longer than the flowering stem.

They are green with brown or dark purple edges and tips and as with others in the genus, are inverted so that the labellum is above the column rather than below it.

The lateral sepals are curved, 4–5 mm (0.16–0.20 in) long, with their upper parts free from each other.

[2][3] Prasophyllum goldsackii was first formally described in 1978 by Joseph Weber and Robert Bates and the description was published in Journal of the Adelaide Botanic Garden from a specimen collected by "H.

The main threats are dryland salinity, vegetation clearance, weed invasion and grazing by pest animals.