Objective To explore the effectiveness of multidisciplinary intervention for patients with gestational diabetes mellitus (GDM). Methods A total of 126 patients diagnosed with GDM from January 2020 to December 2021 in our hospital were enrolled in this retrospective study. Patients were divided into the control group (conventional treatment) and the study group (adding multidisciplinary intervention). Glucose index, self‐management ability, psychological status, and delivery outcomes were evaluated. Results Fasting plasma glucose (4.32 ± 0.81 mmol/L), glycosylated hemoglobin (5.47 ± 1.09%), and postprandial blood glucose (6.02 ± 1.47 mmol/L) after intervention in study group were significantly lower than those in control group (p < 0.05), as well as those before intervention (p < 0.05). The score of GDM knowledge (38.03 ± 2.76), self‐management (38.93 ± 2.32), social support (17.84 ± 1.23), and belief (17.93 ± 1.09) were all significantly higher than those of control group (p < 0.05), as well as those before intervention (p < 0.05). Besides, anxiety (7.83 ± 1.59) and depression (10.29 ± 1.82) evaluation scores showed that emotional relief were significantly achieved after intervention in study group compared with control group (p < 0.05). Moreover, the incidence of postpartum hemorrhage, cesarean delivery, premature delivery, macrosomia, and neonatal hypoglycemia was also significantly improved after intervention in study group compared with control group (p < 0.05). Conclusions Multidisciplinary intervention can effectively control blood glucose levels, adjust self‐management behavior, relieve psychological disorder, reduce complications, and improve delivery outcomes of GDM patients.