Abstract: In the process of acid pickling, 0Cr18Ni9 stainless steel thin-wall products are easily over-etched. The stainless steel strips with the thickness of 0.1mm were used to study the influencing factors of acid pickling. The test results are as follows:(a) 0Cr18Ni9 stainless steel in different status has different corrosion resistance. The annealed material is more likely to be over-etched. (b) The temperature of acid fluid, acid picking time, and concentration of acid fluid have a significant influence on the corrosion degree and mechanical property of stainless steel. (c) In the process of acid pickling, the etchant containing hydrofluoric acid lowers on the mechanical property of 0Cr18Ni9 stainless steel and causes material embrittlement during the acid pickling. (d) The higher the content of hydrofluoric acid is, the greater the influence on the mechanical property of 0Cr18Ni9 stainless steel is.