Dust mask

A dust mask, which has the advantages of good dustproof effect and convenient use, comprises a water discharging and filling device, an inlet tube, an exhaust tube and a connecting tube; wherein, the water discharging and filling device consists of an upper water discharging and filling bottle and a lower water container which are integrated together; a horizontal partition board is firmly mounted in the water discharging and filling bottle and the water container; the inlet tube upwardly and downwardly passes through the upper surface of the water discharging and filling device and the horizontal partition board, and is respectively firmly connected with the water discharging and filling device and the horizontal partition board; the exhaust tube passes through the upper surface of the water discharging and filling device; the upper end of the exhaust tube is firmly connected with the connecting tube; the other end of the connecting tube is firmly connected with a mask; ties are firmly connected with the mas