The present disclosure provides an atomizing device, including a liquid reserving assembly and a cigarette holder assembly rotatably mounted at one end of the liquid reserving assembly. A liquid storage cavity is formed inside the liquid reserving assembly, and a liquid inlet is arranged at one end of the liquid reserving assembly corresponding to the cigarette holder assembly. The cigarette holder assembly includes an axially-penetrating smoke outlet, the liquid reserving assembly includes a smoke passage correspondingly communicating with the smoke outlet, and the cigarette holder assembly blocks the liquid inlet. The cigarette holder assembly includes a positioning member axially movable between a first position and a second position; when being in the first position, the positioning member is engaged with the liquid reserving assembly, and the cigarette holder assembly blocks the liquid inlet; and when being in the second position, the positioning member is separated from the liquid reserving assembly.