The invention provides a honeycomb-type thermal neutron detector which comprises a honeycomb structure, wherein the honeycomb structure is composed of one or more hollow regular hexagonal prism shaped honeycomb units, and the inner side of the pipe wall of each honeycomb unit is coated with neutron absorbing materials. Because the honeycomb structure which is sensitive to neutrons is adopted, the honeycomb-type thermal neutron detector provided by the invention can carry out thermal neutron detection without using badly-needed nuclide <3>He, thereby effectively reducing the manufacturing cost of the thermal neutron detector; and the honeycomb-type thermal neutron detector provided by the invention has the characteristics of decreasing or eliminating dead zones of neutron detection, and the like.