The present disclosure provides an electronic cigarette and a bilayer tobacco liquid storing structure thereof. The bilayer tobacco liquid storing structure includes an upper cover assembly, a lower cover assembly, a liquid-flow regulating assembly, a first liquid storage chamber and a second liquid storage chamber. The upper cover assembly is configured to be connected to one end of the first liquid storage chamber. The liquid-flow regulating assembly has two ends connected to the first liquid storage chamber and the second liquid storage chamber respectively. The lower cover assembly is configured to be connected to the second liquid storage chamber. The liquid-flow regulating assembly is configured to enable the communication between the first liquid storage chamber and the second liquid storage chamber. The electronic cigarette according to the present disclosure makes full use of the internal space and thus enlarges the liquid storage space and improves user experience.