The invention provides an annealing method and device of bell type furnaces, comprising 3-12 bell type furnaces and auxiliary systems, wherein each bell type furnace is internally provided with radiant pipes, the radiant pipes in a cooling bell type furnace are communicated are communicated with a preheating bell type furnace, and the radiant pipes in the preheating bell type furnace are communicated with the cooling bell type furnace. The bell type furnaces work in a serial connection mode and are respectively used for preheating, heating and cooling processes, materials to be annealed are sequentially conveyed among the preheating bell type furnace, a heating bell type furnace and the cooling bell type furnace, and the materials to be annealed in the preheating bell type furnace are heated by using heat generated by the cooling state bell type furnace through the circulating flow of shielding gas. In the invention, the shielding is adopted for direct heating, therefore a heating bell and a cooling bell are omitted, a flow is simplified, equipment investment and operation cost are saved; and dirt on the surfaces of the materials to be annealed are removed in the preheating bell type furnace, the heating process and the cooling process are carried out in a clean furnace, and the surface quality of an annealed product is good.