Natural sources especially herbal drugs are a reliable source of treatment for various ailments in ancient to present times. Alstonia scholaris Linn R. Br. belongs to the family Apocynaceae also known as the devil's tree it is used in the treatment of many human diseases. Traditional knowledge related to Alstonia scholaris is useful in the treatment of malaria, abdominal disorders, dyspepsia, skin diseases, leprosy, chronic and foul ulcers, tumors, asthma, bronchitis, agalactia, helminthiasis, and various infirmities. The present research work is based on the Pharmacognostic and Phytochemical evaluation of different parts (Leaves, flowers, and bark) of the plant Alstonia scholaris Linn. R. Br. Important diagnostic and microscopic characteristics including phloem fibers, stone cells, and calcium oxalate crystals are found. Performed the successive extract of the different parts of the plant eg. (Leaves, flowers, and bark) and preliminary phytochemicals screening. Phytochemical screening results confirm the presence of different primary and secondary metabolites like alkaloids, glycosides, tannins etc. The study will provide referential initial information for the correct identification of the plant.