The invention relates to a system for predicting the risk of death of a patient. The system for predicting the risk of death of a patient comprises: a data acquisition module used for obtaining the medical history of a patient, physiological parameters of the patient and laboratory parameters of the patient, wherein the physiological parameters comprise the Glasgow Coma Scale of the patient, the heart rate of the patient, the systolic pressure of the patient and the oxygen saturation of the patient, and the laboratory parameters comprise the hemoglobin level, the leukocyte count, the creatinine concentration, the blood potassium concentration, the blood sodium concentration, the urea content, the platelet count, the total bilirubin concentration, the D-dimer level and the fibrinogen content of the patient; and a module for calculating the death risk of the patient used for calculating the information acquired in the data acquisition module so as to calculate the 7-day death rate (p) ofthe patient.