The invention discloses a conical cell board. The conical cell board is a stereoscopic conical cell core board consisting of normal cones and inverted cones which are uniformly distributed. Due to stereoscopic characteristic of the cones, the conical cell board has the stereoscopic effect that two planes thereof are obliquely connected with the numerous normal cones and the numerous inverted cones mutually, and further has high mechanical performance due to the fact that side surfaces of the normal cones and side surfaces of the inverted cones have certain thicknesses and are combined. Large conical cells and small conical cells are uniformly arranged on both the upper plane and the lower plane of the conical cell core board. An upper cover board and a lower cover board of the conical cell board are provided with large bumps and small bumps which are approximately in mechanical fit with the large conical cells and the small conical cells on the conical cell core board, so that a three-piece integrating effect is achieved, and the mechanical performance of the conical cell board is strengthened. Both the upper plane and the lower plane of the metal conical cell core board are provided with conical cell small-head planes. The upper cover board and the lower cover board of the conical cell board can be subjected to diffusion welding under identical pressure so as to achieve a metallurgical combination effect, and also can be connected with each other by metal structures. Indexes of the mechanical performance of the metal conical cell board can be increased after the upper cover board and the lower cover board are connected with each other by the metal structures.