Parotid lymphoma is a malignant tumor originating in the parotid tissue and is a type of salivary gland lymphoma, a rare type of lymphoma. The development of parotid lymphoma is closely related to radiation. In addition, viral infections, frequent exposure to smoke, dust and chemical carcinogens may also be associated with the development of this disease. In addition, immune dysfunction may also lead to parotid lymphoma. The common symptom of parotid lymphoma is a progressively enlarging, non-fixed mass, which is usually unilateral and painless. In some cases, localized pain and enlarged lymph nodes in the neck may be present. The diagnosis is made mainly by obtaining tissue for pathological examination. Treatment of parotid lymphoma is mostly surgical excision and postoperative radiotherapy for stage 1. In stage II, surgical resection is followed by radiotherapy or chemotherapy. Stage III to IV is mainly chemotherapy and radiotherapy for comprehensive tumor treatment.