Testing system and testing method for air permeability of diaphragm

The invention provides a testing system and a testing method for air permeability of a diaphragm. The system comprises a diaphragm sealing device, an air supply pressure control device, a sample table, a center control device, and a pressure inductor, a heating device, a temperature measuring device and a gas flow rate inductor arranged in the diaphragm sealing device. The heating device can measure the air permeability of the diaphragm at different temperatures. The air permeability can be read and stored in real time by means of the central control device, some basic performance parameters of the diaphragm in different temperature environments are known, and the change gesture of the air permeability of the diaphragm under continuous temperature change is know, too, so that the testing efficiency is high. The gas flow rate measured by the gas flow rate inductor represents the air permeability of the diaphragm, each gas flow rate represents the air permeability of the diaphragm, the air permeability of the d