An electronic cigarette, including a mouthpiece assembly, an atomizing assembly, and a battery assembly. The mouthpiece assembly is disposed on the atomizing assembly. The atomizing assembly is disposed in the battery assembly. The mouthpiece assembly includes a mouthpiece and a mouthpiece cap covering the mouthpiece. The atomizing assembly includes a limit cover, a heating wire, a silicone support, and joints. The battery assembly includes a rotatable cover, a silicone seal, a seal ring, a cartridge, a silicone connector, a battery cell, a pneumatic switch, a silicone base, and a base sleeve.