Multi-stage type crucible heat insulation device

The utility model relates to a multi-stage type crucible heat insulation device which comprises a heat insulation layer, wherein the heat insulation layer is arranged in an inner cavity of a sintering furnace, a crucible is arranged inside the sintering furnace, the heat insulating layer is placed between the sintering furnace and the crucible, the heat insulation layer comprises a base and at least two heat insulation rings, the crucible is arranged on the base, each heat insulation ring comprises at least two arc heat insulation pieces, adjacent arc heat insulation pieces are mutually linked to form a ring shape, the heat insulation rings are wound on he crucible and mutual overlapped in an up-and-down mode, the heat insulation rings are formed through a mode of small parts of the arc heat insulation pieces, only the damaged arc heat insulation pieces need to be replaced under the condition that the heat insulation rings are damaged, resources are greatly saved, and cost is reduced.