The work aims to study corrosion behavior of anilinete tramer-PEG amphiphilic block copolymer (PEG-TA) on Q235 steel in 1 mol/L HCl medium. Corrosion inhibition of self-made PEG-TA on Q235 steel in 1 mol/L HCl medium was studied by performing static weightlessness test, electrochemical test and corrosion surface observation, and its adsorption behavior on Q235 steel was discussed. FTIR and UV spectra showed that the amphiphilic block copolymer PEG-TA was successfully made from amine-capped aniline tetramer and polyethylene glycol. Polarization curve study showed that the addition of PEG-TA could obviously inhibit the corrosion of Q235 steel in 1 mol/L HCl medium, the inhibition efficiency increased as the PEG-TA concentration increased. Provided with experimental temperature of 25 ℃ and mass concentration of 30 mg/L, inhibition efficiency of the PEG-TA was up to 93.97%, hence PEG-TA was a cathodic inhibition-oriented mixed type inhibitor. The electrochemical impedance spectroscopy study showed that with the increase of PEG-TA concentration, charge transfer resistance and film resistance of surface corrosion reaction gradually increased, content and coverage of corrosion inhibitors on steel increased, corrosion inhibition improved. Adsorption of PEG-TA inhibitor molecules on Q235 steel surface adsorption coincided with Langmuir isothermal model, and was classified as physical and chemical mixed adsorption. SEM study further proved that PEG-TA could effectively inhibit the corrosion of Q235 steel in 1 mol/L HCl. PEG-TA is an effective corrosion inhibitor which can effectively improve the corrosion resistance of Q235 steel in 1 mol/L HCl.