The Phoenix loureiroi contains solitary and clustering plants with trunks from 1-4 m (3-12 feet) high and 25 cm (10 inches) in width, usually covered in old leaf bases. The leaves vary to some degree but usually reach 2 m (6 feet) in length with leaflets wide at the base and sharply pointed apices. The leaflets emerge from the rachis at varying angles creating a stiff, plumose leaf.
The fruit is a single-seeded drupe, bluish-black when ripe, produced on erect, yellow inflorescences, usually hidden within the leaf crown. The species is noted for its variability in different habitats