In this paper, the problem of nonstandard samples of cigarette packet found in daily patrol inspection is taken as the starting point. Based on the research of equipment testing principle, we designed a method to obtain the minimum detection limit of the cigarette package appearance detection device. Through a large number of simulation experiments, accurate and reliable experimental data conclusions are obtained, the quantitative evaluation of the detection capability of the cigarette packet appearance detection device is realized, and provided a quantitative reference for the validity verification of the cigarette package appearance detection device.