The invention discloses a composite filter rod with corncob particles. The corncob particles are obtained by performing microwave expansion, grinding and pelleting, baking and modulating a corncob. The corncob particles are applied to a cigarette filter, the adding amount of the corncob particles is 15-50% of the total weight of the filter rod, and an obtained binary composite filter rod is applied to a cigarette. The actual application shows that ingredients in the cigarette smoke, such as tar, nicotine and phenol, can be effectively reduced. The composite filter rod with the corncob particles is convenient to operate, low in cost, and has a good application prospect.