Objective To explore the effect of nudge theory-based, hospital-community-family cooperative breastfeeding intervention. Methods A total of 134 pregnant women between 28 and 32 weeks of gestation were enrolled and divided into two groups of 67.The control group received standard perinatal care and health education, while the intervention group was subjected to hospital-community-family cooperative breastfeeding intervention based on nudge theory. Results Fifty-six women in the control group and sixty in the intervention group completed the study.The total scores of breastfeeding knowledge and self-efficacy at 1, 3 and 6 months postpartum in the intervention group were significantly higher than those in the control group （all P＜0.05）.The intervention group had significantly lower incidence of breast problems at 1 and 3 months postpartum, and higher exclusive breastfeeding rates at 1-6 months postpartum compared with the control group （all P＜0.05）. Conclusion The nudge theory-based, hospital-community-family cooperative breastfeeding intervention can effectively enhance breastfeeding knowledge and self-efficacy of pregnant women, reduce breastfeeding-related breast problems, and increase exclusive breastfeeding in the first 6 months.