Horizontal vacuum annealing furnace is an annealing equipment for electromagnetic materials and non-ferrous metals in electrical industry. It is especially suitable for vacuum protection annealing of rolled iron core, three-dimensional triangular iron core, annular iron core, EI sheet, C-shape and flat silicon steel sheet. It can fully meet the annealing process, make the annealed iron core bright without oxidation, eliminate the internal stress caused by mechanical processing, reduce the iron loss, and has excellent annealing performance; the annealed iron core is bright without oxidation, eliminate the internal stress caused by mechanical processing, make the atoms in the metal regularly arrange, improve the magnetic properties of silicon steel sheet coil iron core, and reduce the iron loss. The furnace has obvious advantages of structure application, simple and convenient operation, reliable process quality, high efficiency and energy saving. It is an ideal equipment for magnetic materials and transformer production industry.