The invention discloses a dust mask which comprises a main body casing, a head belt and a head belt ball handle connected with the head belt. The dust mask is characterized in that breathing rubber tubes corresponding two nares in position are arranged on the main body casing; first breathing valve blocks are arranged on the breathing rubber tubes; second breathing valve blocks are arranged on the inner walls of the breathing rubber tubes and located at the joints of the breathing rubber tubes and the main body casing; a filter box is arranged in the main body casing; a filter element for accommodating various perfumes is placed at the end, close to the nares, of the filter box; a raised slide way is arranged on the filter element; the slide way is clamped in a corresponding slide groove of the main body casing; and the part, contacted with the face of a user, of the main body casing is sleeved with a sealing ring. The dust mask provided by the invention has the benefits as follows: the structure is simple and reasonable, oxygen can be effectively and conveniently separated from waste air the user exhales, and the covering area is small so that the user feels more comfortable and becomes healthier.