Dillwynia parvifolia is a spreading to erect shrub that typically grows to a height of and has tiny hairs on the stems. The leaves are twisted, narrow oblong, long and glabrous. The flowers are arranged in umbels of up to six on a peduncle up to long with bracts and bracteoles long. The sepals are long and glabrous and the standard petal is long and yellow with red markings. The fruit is a pod long.