This paper presents the results of the review pharmacognostic study of common toothwort, a perennial plant, parasitizing on the roots of trees. Currently, in Russian traditional medicine, there is considerable experience in the use of сommon toothwort (Lathraea squamaria L.) herb and roots as antitumoral, biligenic, infertility-treatment and diuretic drugs. The chemical composition of L. squamaria has not been quite well determined. Phenylethanoid glycosides (acteoside, isoacteoside), iridoid glycosides (aucubin, and aucuboside ester, 6'-O-glucopyranosyl-aucubin, melampyroside, 6'-O-glucopyranosyl melampyroside), simple sugars, fatty acids, organic acids, β-sitosterol were identified. Further study of L. squamaria raw materials is a very promising field including implementation in official medicine. © 2020 Phcogj.Com. This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 International license.