The invention provides a cigarette stabilizing device of a cigarette carton sealing machine. The cigarette stabilizing device comprises a cigarette pushing plate, negative pressure suction parts, a first in-place detection switch, a second in-place detection switch, a controller and a solenoid valve, the first in-place detection switch is used for being relative to a cigarette on the uppermost layer of a cigarette stack; the cigarette pushing plate is provided with a cigarette pushing surface, the four negative pressure suction parts are correspondingly arranged on the extension direction of the cigarette pushing surface; the solenoid valve is a two-position three-way solenoid valve, when the solenoid valve is in a first working position, a negative pressure air system communicates with the negative pressure suction parts; when the solenoid valve is in a second working position, a positive pressure air system communicates with the negative pressure suction parts; the solenoid valve iselectrically connected with the controller; the second in place detection switch is used for detecting whether the cigarette stack is pushed into a box in place or not; and the first in-place detection switch and the second in-place detection switch are electrically connected with the controller correspondingly. The cigarette stabilizing device of the cigarette carton sealing machine can better avoid the position deviation of the cigarette and has a function of self-cleaning.