A novel air filter, comprising a bearing frame (1). A placement groove (2) is formed on one side of the bearing frame (1); a driving rotating shaft (3) is fixedly connected to the inner cavity of the bearing frame (1); the inner wall of the bearing frame (1) is movably connected to a bearing machine body (4) by means of the driving rotating shaft (3); an air inlet (5) is fixedly connected to the left side of the bearing machine body (4); an air outlet (6) is fixedly connected to the right side of the bearing frame (1); a buffering groove (7) is formed on the rear surface of the bearing machine body (4); adjustment rotating shafts (8) are symmetrically and fixedly connected to the left and right sides of the inner cavity of the buffering groove (7); air measurers (9) are fixedly connected to the opposite sides of the adjustment rotating shafts (8); a PLC controller (10) is fixedly connected to the inner cavity of the bearing machine body (4); and a bearing plate (11) is fixedly connected to the upper end of the inner cavity of the bearing machine body (4). The present invention performs automated control by means of the provided the PLC controller (10), and monitors the quality of air by means of the provided air measurers (9) in real time.