An air filtering module (100; 1000; 2000; 3000; 4000) comprising: a cyclone (110; 1100; 2100; 3100; 4100) including: a contaminated air inlet part (111; 1110; 2110; 3110; 4110) into which external contaminated air and cleaning water for cleaning the contaminated air are introduced; and a cleaned air outlet part (112; 1120; 2120; 3120; 4120) through which air is discharged after being cleaned by bringing the cleaning water into contact with the contaminated air; a water tank (120; 1200; 2200; 3200; 4200; 5200) coupled to the cyclone (110; 1100; 2100; 3100; 4100), the water tank (120; 1200; 2200; 3200; 4200; 5200) being configured to receive the cleaning water from the cyclone (110; 1100; 2100; 3100; 4100), and to store the cleaning water; and a fluid circulating part (130; 1300; 2300; 3300; 4300) configured to provide the cleaning water stored in the water tank (120; 1200; 2200; 3200; 4200; 5200) to the contaminated air inlet part (111; 1110; 2110; 3110; 4110), wherein a central axis of the cyclone (110; 1100; 2100; 3100; 4100) is inclined at an inclined angle with respect to the water tank (120; 1200; 2200; 3200; 4200; 5200), characterized in that the water tank (120; 1200; 2200; 3200; 4200; 5200) further comprises: a groove part configured to receive a side of the cyclone and to support the cyclone at the inclined angle; and a foreign material discharging part located at a position corresponding to the surface of the cleaning water stored in the water tank (120; 1200; 2200; 3200; 4200; 5200), the foreign material discharging part being openable and closable. a cyclone (110; 1100; 2100; 3100; 4100) including: a contaminated air inlet part (111; 1110; 2110; 3110; 4110) into which external contaminated air and cleaning water for cleaning the contaminated air are introduced; and a cleaned air outlet part (112; 1120; 2120; 3120; 4120) through which air is discharged after being cleaned by bringing the cleaning water into contact with the contaminated air; a contaminated air inlet part (111; 1110; 2110; 3110; 4110) into which external contaminated air and cleaning water for cleaning the contaminated air are introduced; and a cleaned air outlet part (112; 1120; 2120; 3120; 4120) through which air is discharged after being cleaned by bringing the cleaning water into contact with the contaminated air; a water tank (120; 1200; 2200; 3200; 4200; 5200) coupled to the cyclone (110; 1100; 2100; 3100; 4100), the water tank (120; 1200; 2200; 3200; 4200; 5200) being configured to receive the cleaning water from the cyclone (110; 1100; 2100; 3100; 4100), and to store the cleaning water; and a fluid circulating part (130; 1300; 2300; 3300; 4300) configured to provide the cleaning water stored in the water tank (120; 1200; 2200; 3200; 4200; 5200) to the contaminated air inlet part (111; 1110; 2110; 3110; 4110), wherein a central axis of the cyclone (110; 1100; 2100; 3100; 4100) is inclined at an inclined angle with respect to the water tank (120; 1200; 2200; 3200; 4200; 5200), characterized in that the water tank (120; 1200; 2200; 3200; 4200; 5200) further comprises: a groove part configured to receive a side of the cyclone and to support the cyclone at the inclined angle; and a foreign material discharging part located at a position corresponding to the surface of the cleaning water stored in the water tank (120; 1200; 2200; 3200; 4200; 5200), the foreign material discharging part being openable and closable. a groove part configured to receive a side of the cyclone and to support the cyclone at the inclined angle; and a foreign material discharging part located at a position corresponding to the surface of the cleaning water stored in the water tank (120; 1200; 2200; 3200; 4200; 5200), the foreign material discharging part being openable and closable.