Mouth mask

Provided is a mouth mask. The mouth mask comprises a mouth mask main body and ear hanging parts arranged on two ends of the mouth mask main body. The middle part of the mouth mask protrudes like a cone. Protruding upper and lower edges extend towards inner side. The mouth mask main body is formed by an active carbon filter element and a mouth mask housing from inside to outside. A breather valve is arranged on the inner side of the active carbon filter element. The mouth mask is well ventilated and comfortable to wear, and hot air breathed out by a user can be discharged.