The technology integrates testing pipeline linkage and auto switching technology, air pressure control technology, special processing material vacuuming technology and secondary development of air test pressure and flow measurement technology, non-leakage quick docking technology, auto air leakage test of fuel cell single cavity, three cavities and complete unit, to achieve fast, stable and reliable air leakage test of fuel cell stack and complete unit, to guarantee effective monitor of fuel cell critical performance quality parameter.