Abstract: In order to reduce the effect of hydrogen sulfide on the corrosion of the inner wall of acid water tank, it is necessary to understand the corrosion mechanism and identify the conditions leading to serious corrosion. In this paper, the corrosion of a tank was analyzed, which lead to the conclusion that the cracking of the tank wall could be attributed to hydrogen bubbling and hydrogen induced cracking. With the purpose of determining the coating structure to reduce the corrosion of hydrogen sulfide in acid water tank, the samples with different coating structures were tested under simulated working conditions. The experimental results showed that the modified epoxy glass flake coating could achieve good anticorrosion effect. Therefore, the modified epoxy glass flake coating has a good effect on preventing the corrosion of the inner wall of the acid water tank caused by hydrogen sulfide.