Disclosed is a supporting frame for mounting a one-way membrane inside a respiratory valve, wherein the supporting frame (8) is arranged on the radical cross-section of the air inlet channel (3) inside the respiratory valve and is an integrated structure together with the air inlet channel (3), a mounting hole (801) for mounting the one-way membrane (2) is arranged in the centre of the supporting frame (8), and several air holes (802) are circumferentially distributed along the edge of the mounting hole (801). The supporting frame simplifies the fixing components needed by the support through designing same and the valve body of the respiratory valve as an integrated structure, makes the internal structure of the respiratory valve more compact, and avoids the risk of having the support dropping out.
