An electronic cigarette, including a mouthpiece assembly, an atomization assembly, and a base assembly. The mouthpiece assembly includes a mouthpiece, a decorative cover, a movable cover, a fixed base adapted to fix the mouthpiece, a seal ring adapted to seal the fixed base, a first seal ring and a second seal ring adapted to seal the mouthpiece, and a sliding block. The atomization assembly includes a positioning pin, a limit spring, an upper holder, a gasket, a third seal ring adapted to seal the upper holder, a glass tube, an upper seal ring adapted to seal the glass tube, a lower seal ring adapted to seal the glass tube, a fourth seal ring adapted to seal the lower holder, a lower holder, a screw, a connecting thread, a spring, a first cylinder, a fifth seal ring adapted to seal the first cylinder, a second cylinder, and an atomizing core.
