Abstract: An electromagnetic powered sputum excretion system comprises a coughing sensor, a frequency input end, an air pressure input end, an electric-controlled switch, a timing input end, a pressure vest (80), an air vibration device (90), and a fan (70). The air is extruded by attracting iron clappers (904) with an electromagnet (906) to generate a vibrating airflow, and the chest of a patient is vibrated by the action on the chest of the patient through the pressure vest (80), thereby the sputum excretion system assists the patient to excrete sputum. Since the control via the electromagnet (906) is characterized by promptness, stability, low energy consumption and the like, the sputum excretion system, which utilizes the electromagnet (906) as a power to generate the vibrating airflow, has above characteristics as well. The present sputum excretion system further has the advantages of simple operation and low cost.