Abstract: The invention discloses a disposable atomizer of an electronic cigarette, comprising a battery component and an atomizer, wherein the atomizer comprises an atomizer cover, a rubber sleeve, an atomizer sleeve, a tobacco tar cotton, two wires, a heating wire, a rubber pad, a threaded sleeve, a propping pin, a first fiber pipe, a tar guide rope and a second fiber pipe; the heating wire is connected with one ends of both wires, and each of the other ends of the wires is fixedly connected with the propping pin; the heating wire and the tar guide rope are wound around together; the first fiber pipe is arranged in the tar guide rope, the second fiber pipe and the first fiber pipe are coaxially arranged, and the second fiber pipe is positioned behind the first fiber pipe; both the tar guide rope and the second fiber pipe are arranged in the tobacco tar cotton, and both the tobacco tar cotton and the threaded sleeve are arranged in the atomizer sleeve; the atomizer cover is arranged at the tail end of the atomizer sle