The invention discloses the supporting frames for installing a unidirectional film in a breather valve, wherein supporting frame (8) is arranged on the basic cross section of air intake duct (3) in breather valve and is the overall structure together with air intake duct (3), a mounting hole (801) for installing unidirectional film (2) is arranged on the center of supporting frame (8), and the generation (802) of several stomatas is circumferentially the edge distribution along mounting hole (801). Supporting frame simplifies the fixing component that the valve body by designing identical and breather valve is needed as an integrally-built bracket, keeps the internal structure of breather valve more compact, avoids the risk with the bracket exited.
