The invention discloses a disposable electronic cigarette, comprising a battery assembly (1) and an atomizer (2). The battery assembly (1) comprises a cigarette tubular housing (11) and a battery (12) the atomizer (2) comprises a casing (21), tobacco tar cotton (22), a U-shaped tar guiding rope (23), a hollow ejector pin (24), a first fiber tube (25), a heating wire (26), conducting wires and a second fiber tube (29). A connection thread (13) is arranged at an end opening where the battery assembly (1) is connected with the atomizer (2), the thread (13) is electrically connected with the negative electrode of the battery, and a battery positive electrode contact is arranged in the center of the end opening the atomizer (2) is provided with a conductive screw sleeve (30) that fits the connection thread (13) one end of the ejector pin (24) is connected with the battery positive electrode contact one end of the heating wire (26) is connected with the ejector pin (24) via the conducting wire (27) while the other end thereof is electrically connected with the conductive screw sleeve (30) via the other conducting wire (28). The disposable electronic cigarette of the invention is large in smoke volume, low in odor generating possibility, simple in structure, convenient for assembly and capable of improving productivity and lowering production cost remarkably.
