The work aims to prepare a novel Mannich base inhibitor and study its performance. The relationship among corrosion efficiency of corrosion inhibitor and mass concentration of corrosion inhibitor, mass fraction of hydrochloric acid, corrosion temperature and corrosion duration was studied by weight loss method. Adsorption curve of the corrosion inhibitor was verified. Comprehensive properties of the corrosion inhibitor were studied by electrochemical impedance spectroscopy and scanning electron microscopy. The surface morphology of N80 sheet steel was observed by SEM. Efficiency of the inhibitor increased as addition of the inhibitor increased, decreased as temperature increased, increased firstly and then decreased as the HCl concentration and corrosion time increased. At 60 ℃, the efficiency of corrosion inhibitor was 99.18 % provided that it was immersed in 15% HCl for 4 h and 1.0 g/L of inhibitor was added. The activation energy of corrosion reaction increased from 56.34 kJ/mol to 86.54 kJ/mol. The adsorption of inhibitor on N80 steel surface followed the Langmuir adsorption isotherm model. ?29.94 kJ/mol of Gibbs free energy was absorbed. The obtained results of polarization experiment indicated that the inhibitor acted as a mixed-type inhibitor mainly featuring in cathodal depression. The SEM observations showed that the corrosion inhibitor can inhibit corrosion of N80 sheet steel effectively. The inhibitor prepared provides good corrosion inhibition effects for N80 sheet steel in 15% HCl solution.