The ventilation assembly for an atomizer in an electronic cigarette has a storage chamber, which includes an inlet passages and a liquid injection channel located therein. The inlet passages and the liquid injection channel are isolated from each other. The ventilation assembly further includes an injection hole, an air inlet, the injection hole is in communication with the liquid injection channel and the storage chamber sequentially; and an exhaust port, the exhaust port, and the air inlet are in communication with the inlet passages; when need to inject cigarette liquid, open the injection hole and inject the cigarette liquid into the storage chamber through the injection hole; after the liquid injection is completed, during closing the injection hole, air received in the storage chamber is discharged from the injection hole, exhaust port, the air inlet passage and the air inlet successively.