Device for measuring air permeability of porous sheet material

The utility model relates to a device for measuring the air permeability of a porous sheet material, which comprises a sample clamp, a clamping and pressing module, a pressure difference measuring module, a gas flow control module and a gas source, the sample clamp comprises two clamps and a breathable core which are attached to each other, and grooves are arranged on the attaching surfaces of the two clamps; the breathable core is positioned in the groove of the clamp; the clamping pressure applying module, the pressure difference measuring module and the gas flow control module are respectively connected with the sample clamp; and the gas source is connected with the gas flow control module. Compared with the prior art, the device has the advantages that the breathable core is placed in the groove of the clamp, so that a material to be tested can be supported, and the breathability of the porous material under different ballast forces can be tested; a gas flow control module and a clamping pressure module a