Occult breast cancer (OBC) is a rare special type of breast cancer. Clinically, the lumps of axillary lymph node is the first symptom, but hard to palpate of breast lumps. All the time, occult breast cancer cases are less. Clinical diagnosis is very difficult. Pathological examination of axillary lymph node puncture combined with immunohistochemistry and imaging examination can improve preoperative diagnosis of the disease.