Box-type high-temperature furnace

The invention relates to the technical field of heating furnaces, and particularly discloses a box-type high-temperature furnace which comprises a furnace body and a furnace door, a heating pipe is arranged in the furnace body, a supporting plate is further arranged in the furnace body, the furnace door is rotationally connected to the furnace body, the supporting plate is arranged in the furnace body in a sliding fit mode, a heat insulation plate is arranged on the supporting plate, and the heat insulation plate is arranged on the furnace body. A driving mechanism is arranged between the supporting plate and the furnace door, the driving mechanism is used for driving the supporting plate to extend out of or retract into the furnace body, and when the supporting plate extends out of the furnace body, the thermal insulation plate can seal the furnace body; according to the box-type high-temperature furnace, when the furnace door is opened, the supporting plate can stretch out of the furnace body through the dr