The invention belongs to the field of cigarette packet packing, in particular to a detection method of cigarette packet packing tightness. The detection method is characterized in that the method is based on pressure sensing cigarette packing tightness detection, and the position of gas leaking can be detected. Compared with the prior industrial standard YC/T140-1998 detection charge method to determine package seal, the tightness of soft and hard packages of cigarette are simultaneously detected, and accuracy is high; meanwhile, the gas leaking position is found. The method is easy to operate and achieve. According to the detecting method, the tightness of cigarette packing is improved by moderately adjusting technical parameters of cigarette packing, thereby the risk of cigarette mildew in long-time storage and transportation. The detection method of cigarette box packing tightness has important significance for cigarette manufacturers to control cigarette quality and protect cigarette storage time, protect consumers' benefit and establish Chinese cigarette image.