The invention relates to an arc extinguishing structure of a fuse. The arc extinguishing structure comprises a body insulator, wherein an upper outlet lead and a lower outlet lead are respectively arranged on both ends of the body insulator, an upper electrode and a lower electrode, which correspond to the upper outlet lead and the lower outlet lead respectively, are arranged in the body insulator, a fusion tube provided with a fuse wire is arranged in the body insulator, both ends of the fusion tube are in contact with the upper electrode and the lower electrode respectively, an arc extinguishing tube and an arc extinguishing rod, which are matched with each other, are further arranged in the body insulator, a slit is arranged between the arc extinguishing tube and the arc extinguishing rod, the fusion tube penetrates through the slit, and a gassing material is coated on the fusion tube. The arc extinguishing structure, provided by the invention, has the beneficial effects that the arc extinguishing structure is reasonably structured, through high temperature generated by electric arc, the gassing material on the fusion tube releases gas to blow out the electric arc, and a good arc extinguishing effect is achieved; and the whole arc extinguishing device is located in the body insulator, and is fully closed, so that the arc extinguishing device is not polluted, thus the arc extinguishing effect is always effectively ensured.