An electronic cigarette, comprising: a mouthpiece assembly (A), the mouthpiece assembly (A) comprising a mouthpiece and a mouthpiece cap covering the mouthpiece ; an atomizing assembly (B), the atomizing assembly comprising a limit cover , a heating wire , a silicone support , and joints ; and a battery assembly (C), the battery assembly comprising 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 ; wherein: the mouthpiece assembly (A) is disposed on the atomizing assembly (B); the atomizing assembly (B) is disposed in the battery assembly (C); the heating wire is disposed in the silicone support ; the silicone support comprises a bottom end which is provided with two holes; the joints are inserted in the two holes, and two pins of the heating wire are fixed in the silicone support via the two joints ; the silicone support is disposed in the limit cover ; the silicone connector is disposed in the cartridge and connect and fix the atomizing assembly; the pneumatic switch is disposed in the silicone base , and positive and negative electrodes of the pneumatic switch are connected to positive and negative electrodes of the battery cell , respectively; the battery cell , the pneumatic switch , and the silicone base are disposed in the cartridge ; the cartridge comprises an e-liquid tank and an e-liquid inlet communicating with the e-liquid tank; the rotatable cover is adapted to cover the e-liquid inlet; the base sleeve is sheathed on the cartridge ; the cartridge comprises a joint pin adapted to connect to the mouthpiece; the seal ring is sheathed on the joint pin of the cartridge ; the silicone seal is disposed on the cartridge ; the rotatable cover is rotatably disposed on the cartridge and covers the silicone seal . a mouthpiece assembly (A), the mouthpiece assembly (A) comprising a mouthpiece and a mouthpiece cap covering the mouthpiece ; an atomizing assembly (B), the atomizing assembly comprising a limit cover , a heating wire , a silicone support , and joints ; and a battery assembly (C), the battery assembly comprising 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 ; the mouthpiece assembly (A) is disposed on the atomizing assembly (B); the atomizing assembly (B) is disposed in the battery assembly (C); the heating wire is disposed in the silicone support ; the silicone support comprises a bottom end which is provided with two holes; the joints are inserted in the two holes, and two pins of the heating wire are fixed in the silicone support via the two joints ; the silicone support is disposed in the limit cover ; the silicone connector is disposed in the cartridge and connect and fix the atomizing assembly; the pneumatic switch is disposed in the silicone base , and positive and negative electrodes of the pneumatic switch are connected to positive and negative electrodes of the battery cell , respectively; the battery cell , the pneumatic switch , and the silicone base are disposed in the cartridge ; the cartridge comprises an e-liquid tank and an e-liquid inlet communicating with the e-liquid tank; the rotatable cover is adapted to cover the e-liquid inlet; the base sleeve is sheathed on the cartridge ; the cartridge comprises a joint pin adapted to connect to the mouthpiece; the seal ring is sheathed on the joint pin of the cartridge ; the silicone seal is disposed on the cartridge ; the rotatable cover is rotatably disposed on the cartridge and covers the silicone seal . <EOS>