The disclosure provides an electronic cigarette, wherein the electronic cigarette comprises an upper-cover assembly and a lower-cover assembly. The upper-cover assembly and the lower-cover assembly are cooperated to together form an oil-storing chamber. The lower-cover assembly comprises a connecting element, a bottom cover and a sealing element detachably connected to the bottom cover. One end of the connecting element is connected with the bottom cover, and the other end of the connecting element is connected with the upper-cover assembly. The bottom cover defines an oil-refilling hole. The connecting element defines a through hole communicating with both the oil-refilling hole and the oil-storing chamber. When the sealing element is connected with the bottom cover, the sealing element extends through the oil-refilling hole and is accommodated in the through hole. The electronic cigarette of the present disclosure has a simplified structure and is able to be refilled with oil conveniently, avoiding oil-leakage.