Mask with breathing window

The utility model discloses a mask with a breathing window, which comprises tying belts, a mask body and the breathing window, the tying belts are connected to two side edges of the mask body, the breathing window is arranged on the mask body, the breathing window comprises a fixed frame, a cover plate, a movable buckle and a filter membrane, one side edge of the cover plate is hinged with the fixed frame, and the other side edge of the cover plate is provided with a handle extending outwards along a plate surface. A notch groove corresponding to the handle is formed in the fixing frame, the filter membrane is located in the fixing frame, the cover plate is buckled on the fixing frame to fix the filter membrane, and when the cover plate is buckled, the handle is located in the notch groove, and the movable buckle is rotated to buckle the handle. And a plurality of air holes are distributed in the plate surface of the cover plate. Due to the adoption of the structural form of the movable buckle of the breathin