Abstract: An air-purifying breathing apparatus is provided. The breathing apparatus comprises an air chamber with a filter disposed therein. The air chamber is directly communicated with a respiratory tract through pipes. Therefore, the air-purifying breathing apparatus has the advantages of completely filtering air; avoiding backflow; and making full use of filtered fresh air. Further, the breathing apparatus is directly communicated with the respiratory tract, thus fitting various facial forms of different people. Moreover, various filter elements can be used, such that the breathing apparatus is applicable to various working and living environments.