Portable oxygen mask for underground ventilation

The utility model discloses a portable oxygen mask for underground ventilation, which comprises a mask body, the center of the front surface of the mask body is communicated with a circular tube, andfirst vent holes are equidistantly formed in the front surface of the mask body and positioned on two sides of the circular tube; according to the utility model, the cover body, the circular pipe, thefirst vent hole, the transparent cover, the threaded ring, the circular cylinder, the honeycomb activated carbon layer, the filter cotton layer and the second vent hole are arranged; the oxygen masksolves the problem of common oxygen masks for underground work; only a dustproof effect can be achieved; however, harmful gas in the air cannot be filtered and removed; the body health of workers is threatened; moreover, the dust cleaning process of the oxygen mask is complex, workers need to spend a large amount of time in cleaning, work of the workers is affected, normal use of the oxygen mask is hindered, and the oxygen