Conospermum brachyphyllum is an open shrub that typically grows to a height of. It has ascending, thread-like leaves, long and wide. The flowers are arranged in a panicle of spikes on a peduncle long with bluish-brown bracteoles long and wide with a woolly base. The flowers are white, forming a tube long, the upper lipegg-shaped, long and wide, the lower lip joined for long with lobes long. Flowering occurs from August to October.