An electronic cigarette including an atomization assembly and a battery assembly. The atomization assembly includes a mouthpiece; a first spring disposed in a cavity of the mouthpiece; a first connection ring; a first seal ring sealing the first connection ring; a first fixed seat fixing the mouthpiece; a silicone gasket; a hollow rod; a first fixed ring fixing the hollow rod; a glass tube; a second seal ring and a third seal ring sealing two ends of the glass tube, respectively; a second fixed ring fixing the glass tube; an atomizer; a regulating ring; a second fixed seat fixing the atomizer; a fourth seal ring and a fifth seal ring sealing two ends of the second fixed seat, respectively; a second spring; a first threaded ring; a first insulation ring being sheathed on the atomizer; and a first joint directly connected to the atomizer.