The invention discloses an air closing test method. The air closing test method is characterized by comprising the following steps: (1) the pressure test and the tightness inspection are performed for a pipe blockage airbag and a water closing and air closing test airbag before use; (2) an air compressor is provided with a pressure control device and a pressure relief device for guaranteeing the controllability of an air charging process; (3) no cracks and holes and tight joints of a pipe are guaranteed before the test; (4) the inner walls, contacted with a pipe plug, of the two ends of a drainage pipe for a water closing and air closing test are treated to become clean and smooth; (5) the pipe cannot be refilled before a water closing test; and the building height of an inspection well is higher than the top of the pipe by 500 mm; and (6) the pipe blockage airbag and the water closing and air closing test airbag are respectively mounted at the two ends of the internal of the pipe; and a pressure gauge and an air charging nozzle are connected to every end. The air closing test method has such advantages as simple operation, durability, high safety, dual purposes of one plug, high construction efficiency and resource saving, and facilitates the promotion of energy conservation and environmental protection.