Objective To explore the influencing factors of autoimmune thyroid disease in Xindu region and provide a basis for preventing the occurrence of autoimmune thyroiditis.Methods Using case-control study, 581 autoimmune thyroid patients treated in 2016-2020 in Chengdu Xindu District Hospital of 2020, and 450 healthy patients were selected as the control group. Relevant data were obtained and the influencing factors of adult autoimmune thyroid disease were analyzed by univariate and multivariate logistic regression model. Results Univariate results showed that the observed BMI of 30.0 kg/m², hyperlipidemia, metabolic syndrome and urinary iodine (<100 μg/L and> 200 μg/L) were higher than control group, with thyroid function [free triiodinated thyrigenine (FT3), free thyroxine (FT4) and thyroid stimulating hormone (TSH)), autothyroid antibody [thyroglobulin antibody (TGAb), antithyroid peroxidase antibody (TPOAb),] greater than control group (P <0.05).According to logistic regression analysis, body mass index 30.0, TGAb positive, TPOAb positive, hyperlipidemia, and metabolic syndrome were independent risk factors for adult autoimmune thyroiditis [OR (95% CI): 1.965 (1.340), 3.1262 (1.568-8.243), 3.089 (1.753-7.166), 2.507 (1.164 -4.956), 2.218 (1.207 -3.362), P <0.05]. Conclusion Body mass index of 30.0 kg/m2, hyperlipidemia and metabolic syndrome are the risk factors for adult autoimmune thyroiditis in Xindu region.Controlling weight, controlling autoimmune thyroiditis and metabolic syndrome are the key to reducing adult autoimmune thyroiditis in Xindu region.