The combat against corrosion of metals is of technical, economic, ecological and aesthetic importance. The use of inhibitors is one of the best options for protecting metals and alloys from corrosion. The environmental toxicity of organic corrosion inhibitors has triggered the search for green corrosion inhibitors because they are biodegradable and do not contain heavy metals or other toxic compounds. Plant products are not only environmentally friendly and environmentally acceptable, but also inexpensive, readily available and renewable. Studies on the inhibition of corrosion of tannins, alkaloids, organic acids, amino acids and organic dyes of plant origin are interesting. This study focuses on the corrosion inhibition effects of Phoenix Pusilla leaf extract in 1M HCl solutions using weight loss techniques and followed by isotherms adsorption. The results obtained show that the extracts from 1M HCl solutions acted as good corrosion inhibitors. The inhibition efficiency was increased with the increase in the concentration of extract. Data from weight loss experiments and adsorption isotherms (Temkin and Freundlich) have shown that plant extract represents corrosion of steel in acidic media and confirms the adsorption mechanism. The result shows that extracts from Phoenix pusilla leaves act as corrosion inhibitors and can promote surface protection by blocking active areas on the metal.