Objective To explore the effect of WeChat supported hospitalfamily collaborative transitional care on postoperative functional recovery in breast cancer patients Methods A total of 298 breast cancer patients were divided into a control group of 145 and an observation group of 153 according to discharge time, receiving either routine nursing care or WeChat supported hospitalfamily collaborative transitional care. The circumference of the affected limb and range of mobility (ROM) of the shoulder joint were measured at 1 month, 3 months and 6 months after discharge. Quality of life was measured at 6 months after discharge. Results The observation group had milder lymphedema of the affected limb and better ROM of the shoulder joint at 1 month, 3 months and 6 months after discharge, as well as higher quality of life at 6 months after discharge (P<0.01 for all). Conclusion WeChat supported hospitalfamily collaborative transitional care can improve the effect of postoperative functional recovery and enhance quality of life of breast cancer patients.