The invention discloses a honeycombed-core structure. The honeycombed-core structure comprises a honeycombed-core body. The side surface of the honeycombed-core body is further provided with an annular ring groove. The honeycombed-core body is formed by splicing an upper box body and a lower box body, and after splicing of the upper box body and the lower box body is completed, a formed joint is located in the bottom of the ring groove. The honeycombed-core structure further comprises a filling layer which fills the joint. The packing layer is formed by bonding materials or sealing pads. The honeycombed-core structure is convenient to manufacture and high in finished product ratio.