Abstract: Inflammation is one of the ten major characteristics of tumor. Neutrophil, as the main indicator reflecting the body's inflammatory status, can not only promote the development of breast cancer, but also inhibit the development of breast cancer, and is closely related to the treatment and prognosis of breast cancer. This article systematically reviews the relation between neutrophil and breast cancer, and further understands the role, mechanism and clinical value of neutrophil in breast cancer, so as to provide new methods for the treatment and prognosis of breast cancer.