Exogenous allergic alveolitis is caused by inhalation of external organic dust with antigenic properties. It can be treated by avoiding exposure to antigens, medication, and ventilator assistance. 1. Avoiding contact with antigens: patients need to completely avoid contact with organic dust, get out of the working environment of organic dust, improve the surrounding environment, and maintain indoor ventilation. Patients with mildly impaired lung function can recover on their own after avoiding contact with allergens. 2. Medication: If the condition is serious and the patient has symptoms such as coughing, shortness of breath, dyspnea, etc., antibiotics such as levofloxacin can be applied if there is a combination of bacterial infection. If the combined lung fibrosis is obvious, it is also necessary to start anti-fibrosis treatment, apply oral glucocorticoid such as methylprednisolone tablets, dexamethasone tablets, etc., as well as acetylcysteine. 3. Ventilator-assisted: If the patient’s lung function is severely impaired, ventilator-assisted ventilation is also needed after avoiding inhalation of antigens. Exogenous allergic alveolitis needs to be detached from allergens in time, and those with severe symptoms should go to the hospital in time and follow the doctor’s instructions to carry out appropriate treatment.