An electronic cigarette, in which an atomizer assembly protective cartridge is provided outside of the atomizer assembly, and a battery assembly protective cartridge is provided outside of the battery assembly. An atomizing seat fitted with the holder is provided at an inner end of the atomizer assembly. At least a coating layer is provided outside of the atomizer assembly protective cartridge, the holder and the battery assembly protective cartridge, and enables connection between the atomizer assembly protective cartridge, the holder and the battery assembly protective cartridge. In the overall process of assembling the electronic cigarette, since there is no pushing or squeezing action between the atomizer assembly and the battery assembly, it is possible to effectively avoid oil leakage caused by an inclination and a deformation of the atomizing seat under uneven force is effectively avoided.