The present Ph.D. thesis deals with the phytochemical screening on the constituents of Rumex Obtusifolius. Rumex obtusifolius is commonly known as ‘broad-leaf dock’. Itis perennial Herb that grows to a height of 50 to 130 cm. R. obtusifolius occurs along with its very close relative’s R. longifolius and R. crispus. It is widely distributed in ditches, wetlands, riparian areas, roadsides, meadows, waste grounds, disturbed damp areas and pasture fields. This plant is very important in research point of view because of its traditional uses in medicine in several countries of South America. According to folk medicine this plant’s root has a prominent detoxifying result on the liver and is used against fever, jaundice, and as an antianemic tonic. The roots are also laxative. In addition, the leaves of this Rumex are used against hepatic, dermatological and eye problems. They are functional in the relief of furuncles, bruises and are also used as antiseptic and as scar healer. It is used as an antidote to nettle, astringent, depurative, tonic and laxative. It is also used for treatment of tumors, blisters, sores, burns and cancer.