Objective To explore the effectiveness of group-based pregnancy care intervention on pregnancy outcomes of women with subclinical hypothyroidism. Methods Pregnant women with subclinical hypothyroidism who paid regular prenatal visits were divided into 2 groups according to the chronological order of antenatal checkups, with 128 cases in the control group （July to October, 2021）, who was given conventional pregnancy management, and 128 cases in the intervention group （November, 2021 to Februa-ry, 2022） was given group-based pregnancy care intervention.Serum thyroid stimulating hormone （TSH） levels, pregnancy outcomes, pregnancy presssure and social support were compared between the two groups. Results The intervention group had lower serum TSH levels, lower incidence rates of early rupture of membranes, gestational anemia and gestational diabetes than the controls （all P＜0.05） after the intervention; the former also had lower scores in pregnancy pressure, and higher social support than the control group （both P＜0.05）. Conclusion Group-based pregnancy care intervention can reduce pregnancy pressure, and enhance social support in pregnant women with subclinical hypothyroidism, thus improving maternal and infant pregnancy outcomes.