One of the most important metal corrosion inhibitors is the extract of natural plants. They are readily available, non-toxic, environmentally friendly, biodegradable, highly efficient and renewable. This study focuses on the corrosion inhibition effects of the Caralluma indica stem 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. The extract Caralluma indica has inhibitory effectiveness. Phytochemical components with functional groups in extracts of plants adsorbed on the metal surface are responsible for the effective performance of the inhibitor. 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 the Caralluma indica stem extract acts as a corrosion inhibitor and can promote surface protection by blocking the active areas on the metal.