The invention relates to a honeycomb core tunnel composite fireproof board and belongs to the technical field of fireproof boards. The honeycomb core tunnel composite fireproof board comprises a finish coat, a heat insulating layer, an expanded foaming layer, a substrate steel plate, a sealing steel bar plate, a plate fixing part, an anchor rod, an anchor hole, a wall connecting part and bolts. The composite fireproof board is successively prepared from the finish coat, the heat insulating layer, the expanded foaming layer and the substrate steel plate from outside to inner side; bottom platesare arranged at the upper and lower ends of the substrate steel plate, and the middle is a honeycomb core board; the composite fireproof boards are connected through the sealing steel bar plate and the plate fixing part; the anchor rod and the bolt reinforce fixed connection between the composite fireproof boards; and one end part of the wall connecting part is welded and connected to the plate fixing part. The substrate steel plate of the composite fireproof board structure is in a honeycomb core shape inside, is uniform in stress, clear in integral layering and good in fireproof and heat-insulating property, and avoids the problem that the fireproof and heat-insulating effects are not obvious as the composite fireproof board impacted by fire detonation is easy to deform and damage.