An electronic cigarette, and a battery rod and an atomizer thereof are provided in the present application. The battery rod includes a battery rod body, and an air passage of the battery rod body is provided with a waterproof breathable component which cooperates with the air passage and is configured to prevent water from entering into the battery rod body via the air passage, and the atomizer includes an atomizer body, a smoke passage of the atomizer body is provided with a waterproof breathable component which cooperates with the smoke passage and is configured to prevent water from entering into the atomizer body via the smoke passage. Besides of ensuring the breathability of both the air passage and the smoke passage, the waterproof breathable component may also prevent external liquid from entering into the battery rod and the atomizer, thus the waterproof performance of the electronic cigarette is improved.
