Purpose: To determine financial toxicity in young and middle-aged women with breast cancer and examine the associations between family resilience and negative emotions. Methods: A multicentre cross-sectional study was conducted, 538 women with breast cancer were recruited from four hospitals. FT, family resilience, and negative emotions were collected using the Comprehensive Score for FT, the Chinese version of the Family Resilience Assessment in Breast Cancer Patients, Patient Health Questionnaire-9 item, and Generalized Anxiety Disorder-7. This study adhered to the STROBE guidelines. Results: The valid response rate was 96.8 % (N = 521). Overall, the score for FT was 19.63 ± 10.13. FT was significantly correlated with family resilience (r = 0.30, p