Severe low platelet due to lung infection should be firstly clarified whether the low platelet is related to lung infection or not, and should be treated according to the etiology of infection control, general treatment and blood transfusion. 1. Infection control: if the low platelet is caused by serious lung infection, it is considered that the infection causes coagulation dysfunction, resulting in low platelet, then the treatment should be based on the cause of lung infection, and in most cases, the platelet will be restored after applying antibiotics to control the infection. 2. General treatment: when the platelet is too low, we should reduce the activity, avoid trauma, ensure the nutrition supply, eat easy to digest, high nutrition food. 3. Blood transfusion therapy: when platelets are seriously low, single platelet transfusion can be used for treatment. When there is a lung infection with severe low platelet, it is necessary to go to the hospital in time, identify the cause of the disease under the guidance of the doctor and then carry out treatment to avoid danger.