The invention relates to a fuse, in particular to a flat plate type vortex-shaped fuse, which is provided with an insulated shell. A halving wiring groove is arranged in the insulated shell and is made of two half parts. Each half part is made of arc resistant material. The halving wiring groove is a plane divergent polygonal vortex-shaped wiring groove formed between vortex-shaped continuous involute insulating ribs. Fusant grooves are arranged in the polygonal vortex-shaped wiring groove. The two half parts are assembled together in a way that ribs face to grooves and grooves faces to ribs. After assembling, the cross section is a continuous S-shaped passage. The insulating ribs are arranged between adjacent rings of the polygonal vortex-shaped wiring groove. Fusants are inlaid in the fusant grooves. An outgoing cable for leading out the two poles of the fusants from the inside is connected on the insulated shell. The invention mainly solves the technical problem that the existing columnar fuse is not applicable in compact places because of needing enough space in the longitudinal direction. Through changing the internal structure and the external structure of the product, the longitudinal insulation is changed to the transverse insulation and the columnar fuse is changed to the flat plate type fuse, so the height of the fuse is reduced.