The invention discloses a glue applying device for a honeycomb paperboard for food. The glue applying device for the honeycomb paperboard for the food comprises a machine body, glue applying assemblies, a glue supplying device and a heating device; the glue applying assemblies are simultaneously assembled on the two side faces of a paper core and the inner side faces of upper face paper and lowerface paper, the glue applying assemblies comprise glue hoppers and glue applying rolls, the glue supplying device is connected with the glue hoppers, the heating device is connected with the glue applying rolls, each glue applying roll comprises a gas expansion shaft and a plurality of lantern rings, glue applying convex blocks are arranged on the lantern rings, and the lantern rings are arrangedoutside the gas expansion shafts in a sleeving manner; the glue supplying device comprises a glue bucket, glue liquid, a glue pipe, a pneumatic diaphragm pump, an air pressure adjusting valve, a filter and an air pipe; and the heating device is used for heating the glue and provided with a temperature control circuit.