Crinum asiaticum is a perennial herb that typically grows up to tall. It has a leaf base. Its pseudobulb is spherical. The upper part of the bulb is cylindrical. The base is laterally branched, with a diameter of about . Its leaves are lanceolate, margin undulate, apically acuminate. They feature 1 sharp point and are dark green, growing up to 1 m long. Their width is or wider and they number 20–30. The inflorescence is an umbel with 10-24 flowers, six petaloid
tepals, and aromatic. The flower stem is erect, as long as the leaf, and solid. The spathe is lanceolate, membranous, and . The bractlet liner is . Its perianth tube is slender and straight, green white, , diameter 1.5–2 mm. The corolla is spider-like shaped, white, linear, revolute, attenuate, long, and 6–9 mm wide. The corolla is 6-lobed. The pedicel is ca. long. It has 6 reddish stamens. The filaments are long. The anthers are liner, attenuate, ca. long or more. The ovary is fusiform, and up to long. The fruit is an oblate
capsule, green, and in diameter. The seeds are large, and the exotesta is spongy. ==Infraspecies==