Bell jar type sintering furnace heat preservation barrel capable of improving balance performance of temperature field

The invention relates to the technical field of heat preservation of sintering furnaces, in particular to a bell jar type sintering furnace heat preservation barrel capable of improving the balance performance of a temperature field, and the bell jar type sintering furnace heat preservation barrel comprises a base, an inner barrel, a heat preservation layer and an outer barrel, an upper cover plate is arranged at the upper end of the heat preservation layer, a top cover plate is arranged at the upper end of the outer cylinder, and a compression gap is formed between the upper cover plate and the top cover plate. The upper cover plate comprises a guide pin and a compression spring assembly, the heat preservation layer comprises side carbon paper and carbon felt layers wrapping the outer wall of the barrel body layer by layer and a top carbon paper and carbon felt layer wrapping the outer end face of the barrel bottom, and a part of the top carbon paper and carbon felt layer is formed by folding a folding layer