Objective To assess the level of body dissatisfaction among pregnant women and analyze its influencing factors, providing a basis for developing clinical intervention programs. Methods Using convenience sampling, 817 pregnant women attending obstetric outpatient clinics were surveyed with a general information questionnaire, Body Understanding Measure for Pregnancy Scale (BUMPs), the General Self-Efficacy Scale, the Perceived Stress Scale (Chinese version), the Resilience Scale, and the Perceived Social Support Scale. Univariate analysis and multiple linear regression were used to identify factors influencing body dissatisfaction in pregnancy. Results The mean body dissatisfaction score was (41.81±8.34) points. Multiple linear regression analysis indicated that body dissatisfaction was influenced by self-assessment of weight, partner relationship, partner evaluation, resilience, perceived social support, and perceived stress (all P<0.05). Conclusion Body dissatisfaction among pregnant women has been moderately high. Obstetric healthcare providers should prioritize addressing body dissatisfaction during pregnancy, improving partner relationships, and offering tailored social support to reduce perceived stress and, consequently, lower body dissatisfaction levels in pregnant women.