Self-diagnosis method and device for air leakage detector of cigarette making machine and cigarette making machine

The invention relates to a self-diagnosis method and device for an air leakage detector of a cigarette making machine and the cigarette making machine. In the self-diagnosis process, a punching device is actively controlled to stop working, and it is ensured that at least one known unpunched cigarette exists on a production line; when all the known unpunched cigarettes reach the air leakage detection procedure, the air leakage detector is controlled to conduct air leakage detection on all the known unpunched cigarettes, and whether all the cigarettes are unqualified or not is judged. If the air leakage detector judges that all the cigarettes are unqualified, the air leakage detector can be judged to work normally; if not, it can be judged that the air leakage detector is invalid and breaks down. Therefore, according to the method, the known unpunched cigarette is manufactured, and the air leakage detector on the production line is verified in turn. Therefore, online operation can be carried out in self-diagno