Breast cancer is now the most common cancer worldwide, and human Epidermal GrowthFactor Receptor-2 (HER-2) positive breast cancer is more malignant, prone to recurrence and metastasis, and has a poor prognosis.However, the advent of trastuzumab monoclonal antibody, a targeted drug, has since improved the prognosis of patients, and a series of anti-HER-2 targeted drugs have since emerged, including pertuzumab monoclonal antibody, inetol monoclonal antibody, tyrosine kinase inhibitors (Neratinib, Lapatinib, Pyrrolitinib, Tucatinib), antibody drug conjugates SYD985), etc.This paper reviews the progress of targeted therapy for HER-2-positive breast cancer by different mechanisms of action as follows.