The 10% recurrence rate of parotid adenocarcinoma after surgery is not considered high. Parotid adenocarcinoma includes follicular cell carcinoma, mucoepidermoid carcinoma, adenoid cystic carcinoma, epithelial-muscle epithelial carcinoma and so on, among which mucoepidermoid carcinoma and adenoid cystic carcinoma are more common. Mucoepidermoid carcinoma of parotid gland may appear as a painless mass without boundary with surrounding tissues, so it is easy to recur after surgical treatment. Mucoepidermoid carcinoma can be divided into two kinds: highly differentiated mucoepidermoid adenocarcinoma and low-differentiated mucoepidermoid adenocarcinoma, among which highly differentiated mucoepidermoid adenocarcinoma has low recurrence rate and better prognosis after surgery; and low-differentiated mucoepidermoid adenocarcinoma has a high degree of malignant, high recurrence rate after surgery and poor prognosis. Adenoid cystic carcinoma of parotid gland often spreads along the nerves, can develop hematogenous metastasis at an early stage, and is highly invasive locally. Therefore, when parotid adenoid cystic carcinoma is operated, the normal perimeter of the operation should be enlarged, and frozen section should be done intraoperatively in order to find out whether the margins of the surgical incision are clean or not, so as to prevent postoperative recurrence. Those who need surgery for parotid adenocarcinoma should consult the doctor in time, complete the examination, and have the expanded surgical excision of parotid adenocarcinoma performed by a professional doctor, and remove the superficial lobe of the parotid gland if necessary, which can effectively reduce the rate of postoperative recurrence.