The invention relates to a honeycomb paperboard combining method. The method comprises the steps that a honeycomb paper core is stretched and then dried on steam cooling fins; lower-layer facial paperis preheated, and then the lower-layer facial paper and the honeycomb paper core are pasted through glue and heated for enhancing the pasting viscosity; upper-layer facial paper is preheated, the pasted lower-layer facial paper and honeycomb paper core are overturned by 180 degrees, and heating is conducted in the overturning process, wherein the heating temperature ranges from 50 DEG C to 130 DEG C; and the upper-layer facial paper and the honeycomb paper core are pasted through the glue and heated, so that the upper-layer facial paper and the honeycomb paper core are stably pasted to form honeycomb paperboards. According to the honeycomb paperboard combining method, the making method is simple, the steps are easy to operate, and the upper-layer facial paper and the lower-layer facial paper are glued twice and pasted with the honeycomb paper core. Therefore, the moisture content of the honeycomb paperboards can be greatly reduced, the dimensional contraction rate of the honeycomb paperboards in the later processing process can be decreased, and the damage rate in the transportation process can be decreased.