An electronic atomizer includes a cartridge tube provided with an e-liquid storage cavity and a flue, a closure member closing the e-liquid storage cavity, a sealing member, an atomizing core provided in the closure member, and a base. The closure member includes a closure end, an accommodation end extending downward from closure end, a flow passage vertically penetrating through closure member, and an air passage separated from flow passage; the sealing member is integrally formed on closure member and includes a first sealing portion covering outer side of the atomizing core, a second sealing portion covering outer periphery of the closure end and abutting against inner wall surface of the cartridge tube, and a third sealing portion fitted to top end of the air passage and abutting against end edge of the flue; the e-liquid storage cavity communicates with upper end surface of atomizing core through the flow passage.