Air cleaning method for safe isolation ward

The air cleaning method includes the following steps: setting air intake and air exit in the safe isolated ward; setting air intake blower and exhaust blower separately in the air intake and the air exit with the air intake rate being lower than air exit rate to form negative pressure in the isolated ward; and treating both the intake air and exhaust air through three-stage filtering. The said method can make the medical persons and the patients in fresh air and prevent germ and virus in the ward from diffusing to peripheral, so that the ward may be set in any place. The present invention is suitable for safe isolation to infectious diseases, especially SARS, pulmonary tuberculosis and other respiratory tract infectious diseases.