Objective To monitor and analyze salt iodine content and urinary iodine levels among pregnant women in Hongkou District,Shanghai,and provide a basis for scientific iodine supplement for pregnant women.Methods From 2019 to 2021,a total of 450 pregnant women were selected by a stratified random sampling method in Hongkou District,Shanghai.Salt samples of families and random urine samples of pregnant women were collected on a certain day,and the levels of salt iodine and urinary iodine were tested to analyze iodine nutrition levels.Results A total of 450 pregnant women's home salt samples were tested.The coverage rates of iodized salt from 2019 to 2021 were 66.7%,57.3%and 58.0%,respectively.Consumption rates of qualified iodized salt were 47.3%,46.0%,and 46.7%,respectively.A total of 450 random urine samples from pregnant women were tested.The overall median urinary iodine level was 149.0 μg/L.Among the pregnant women,26.4%were in an iodine-appropriate state and 50.4%were in an iodine-deficient state.There was no statistically significant difference in the distribution of iodine nutrition levels among pregnant women during different stages of pregnancy(P>0.05).Conclusion The iodine nutritional status of pregnant women in Hongkou District,Shanghai,is insufficient.We should increase the promotion and popularization of iodized salt among pregnant women,carry out a series of targeted education activities,and continuously improve the coverage rate of iodized salt and the consumption rate of qualified iodized salt.