The present invention relates to an electronic cigarette, including an atomization device disposed with an e-liquid cup, and a mouthpiece disposed at one end of the e-liquid cup. The e-liquid cup has an e-liquid storage space. One end of the e-liquid storage space is sealed and the other end of the e-liquid storage space is open. The mouthpiece is detachably connected with an open end of the e-liquid cup. The mouthpiece of the electronic cigarette of the present invention is detachably connected with the open end of the e-liquid cup, the electronic cigarette has few components, and simple structure, and is convenient to add e-liquid.