Crucible type high-temperature salt-bath heat-treatment electric furnace

The utility model provides a crucible type high-temperature salt-bath heat-treatment electric furnace, comprising a crucible. A furnace body is coated outside the crucible and comprises a furnace shell, a fire-resistant thermal-insulation layer containing a fire-resistant thermal-insulation material, and a resistance heating system which are arranged in sequence from outside to inside; an upper cover board is arranged at the upper part of the furnace body; a furnace cover covers the upper cover board, and the bottom part of the furnace cover is made of heat-resistant steel; a convex part is arranged at the center of the bottom of the furnace cover and extends inside the crucible when the electric furnace works; the periphery of the furnace cover and the upper cover board are in sealed contact; the crucible is made of heat-resistant steel and is supported on a fire-resistant brick at a furnace mouth and the upper cover board through a flange at the top of the crucible at a room temperature; and after a tempera