The atomization effect of the double-medium nozzle directly affects the further improvement of the cigarette feeding process. The work aims to thoroughly analyze the atomization characteristics and improve the atomization effect through the numerical simulation of the atomization process. The numerical simulation method was used to build a two-way coupling numerical model of continuous two-phase flow field and DPM discrete state, and the effects of steam pressure, liquid flow rate and dual-medium nozzle structure on nozzle atomization characteristics were studied. Properly increasing the steam pressure could reduce the atomization diffusion angle, slightly increase the spray distance, improve the atomization fineness, and enhance the atomization effect without affecting the maximum flow rate, particle size uniformity and particle median size. With the increase of the organic liquid flow rate, the atomization diffusion angle increased, the spray distance increased, and the atomization particle size uniformity became better, thus making the atomization effect better. The larger the flow area of the liquid path was, the smaller the penetration distance of the spray was, and the larger the flow area of the gas path was, the larger the atomization diffusion angle of the spray was. If better atomization effect was required, it was necessary to ensure a small flow area of the steam path, and at the same time, the normal opening of the liquid path side was maintained. Properly increasing the flow rate or steam pressure of organic liquid, and adopting a structure with a small flow area of the steam path and a normal opening at the side of the liquid path are conducive to improving the uniformity of the spray of the liquid feed, reducing the waste of the liquid feed, and improving the technological level of cut tobacco preparation.