It has smooth bark, lance-shaped or curved adult leaves, oval to club-shaped flower buds in groups of between seven and fifteen, white flowers and conical fruit.

Eucalyptus multicaulis is a mallee that typically grows to a height of 8 m (26 ft) and forms a lignotuber.

Young plants and coppice regrowth have broadly egg-shaped, bluish or greyish green leaves that are 50–95 mm (2.0–3.7 in) long and 20–45 mm (0.79–1.77 in) wide with a short petiole.

The flower buds are arranged in leaf axils on an unbranched peduncle 10–16 mm (0.39–0.63 in) long, the individual buds on pedicels 4–6 mm (0.16–0.24 in) long.

[2][3][4] Eucalyptus multicaulis was first formally described in 1927 by William Blakely in the Journal and Proceedings of the Royal Society of New South Wales.