Diffusion welding clamp and preparation method of honeycomb structure

The invention provides a diffusion welding clamp and a preparation method of a honeycomb structure and belongs to the technical field of production and processing of honeycomb structures. The diffusion welding clamp is used for preparing the honeycomb structure. The preparation method comprises the following steps: arranging a bottom plate in an inner cavity of equipment, wherein a first to-be-welded metal and a honeycomb core are successively arranged on the bottom plate; arranging a plurality of supporting parts on the edges of the bottom plate surrounding the first to-be-welded metal and the honeycomb core, wherein the supporting parts are arranged perpendicular to the bottom plate, the supporting parts are made of thermoplastic materials and the supporting ends of the supporting partsform a supporting plane to bear a second to-be-welded metal; and arranging a pressure plate on the supporting plane, wherein the pressure plate is driven to provide pressure perpendicular to the direction of the bottom plate so as to weld the honeycomb core between the first and second to-be-welded metals in a vacuum preset temperature condition to form the honeycomb structure. In the preparationprocess of the honeycomb structure, the weight of the honeycomb structure is not increased and the connecting performance of the honeycomb structure can be further improved.