We researched the influence of essential oils from 14 species of plants (Piper cubeba, Cananga odorata, Pelargonium graveolens, Citrus sinensis, Eucalyptus globulus, Lavandula angustifolia, Picea abies, Citrus paradisi, Pterocarpus santalinus, Abies sibirica, Juniperus communis, Melaleuca alternifolia, Syzygium aromaticum and Cinnamomum verum) on the process of sporulation of Eimeria magna Perard, 1925. In the experiment we used 0.5% emulsion of oil during 72 hours, oocysts of E. magna. Essential oil from C. verum exerted the strongest influence on oocysts of E. magna, causing death to 100% of oocysts during 72 hours exposure. About 54% mortality of partially sporulated oocysts was observed during the influence of emulsion of essential oil of S. aromaticum, while no sporulated oocysts were recorded. Many of the tested essential oils can delay the sporulation of E. magna oocysts (P. abies, C. paradisi, P. santalinus, A. sibirica, J. communis, M. аlternifolia). Oils from P. cubeba, C. odorata, P. graveolens, C. sinensis, E. globulus, L. angustifolia had no effect on sporulation of E. magna. Thus, the study of the biological properties of essential oils of C. verum and S. aromaticum is of great interest for further research in the field of parasitology.