This study aims to investigate in vitro antioxidant power of hydro-ethanolic and aqueous extracts of aerial part of Ammi visnaga. Firstly, the extracts were analyzed for the phytochemical compounds contents. It was found that the amounts of tannins, flavonoids and coumarins are significant. However, the mucilage compounds were present in the aqueous extract, and not in the hydro-alcoholic extract. Furthermore, the results showed the presence of triterpenes and alkaloids only in the hydro-alcoholic extract. We also note the absence of saponins, cardiac glycosides, and holosides in both extracts. The flavonoids and total phenols content were performed for both extracts. It shows higher content of flavonoids and total phenols in the hydro alcoholic extract. Results obtained by all of the three radical scavenging activity methods used in this study (DPPH, FRAP and total antioxidant activity), showed higher antioxidant activity for the hydro-alcoholic extract than the aqueous extract of A. visnaga.