The invention discloses a breathing mask with the filtering and purifying functions. The breathing mask is composed of a face guard and a canister. The face guard comprises a guard body, eye windows, an interphone, a breathing valve and a fastener. The breathing mask is characterized by further comprising a double-layer exhalation valve or multi-layer exhalation valve composed of two or more exhalation valve plates mutually combined and connected in series; grids are arranged among the exhalation valve plates as well as between the exhalation valve plates and the guard body; an air inlet is formed in the bottom of the guard body; the air inlet is connected with the canister through an air guiding pipe; the canister comprises a first adsorption part, a catalyzing part and a second adsorption part which are overlaid front and back. According to the breathing mask with the filtering and purifying functions, the content of benzene, methylbenzene, xylene, ethylbenzene, styrene, formaldehyde, acetaldehyde and acrolein which are removed through a catalyst in air of buildings is below 0.05 milligram/m<3>, and the content of microorganisms in circulating air is remarkably reduced at the same time.