A disposable electronic cigarette comprising a sleeve, an atomizing assembly and a battery component. The atomizing assembly comprises an e-liquid cup for storing e-liquid； a cup cover connected to the e-liquid cup and covering an opening of the e-liquid cup, the cup cover is provided with e-liquid permeating holes for guiding the e-liquid out from the e-liquid cup； a heating wire assembly for atomizing the e-liquid outputted from the e-liquid permeable holes； an atomizing seat for fixing the heating wire assembly, the atomizing seat and the cup cover enclose to form an atomizing cavity for accommodating the heating wire assembly. Provided in the axial direction of the atomizing seat are conductive devices and a force applying device used for applying a force in a direction toward the battery component to the conductive devices. An elastic sealing device is provided between the atomizing assembly and the battery component.
