Movable heat preservation device for vacuum distillation furnace

The utility model discloses a movable heat preservation device for a vacuum distillation furnace, which comprises a movable heat preservation barrel and a lifting device, the movable heat preservation barrel is sleeved on a crucible and a condensation collecting device, and the movable heat preservation barrel is configured to move along the vertical direction; the lifting device is arranged at the top of the movable heat preservation barrel and used for driving the movable heat preservation barrel to move in the vertical direction. The lifting device is used for lifting the movable heat preservation barrel, so that the crucible and the condensing device form a movable high-temperature area and a movable low-temperature area in the blow-in process, materials in the condensing and collecting device are volatilized and purified for multiple times, and meanwhile volatile matter is concentrated at one end of the condenser; in the furnace shutdown process, the movable heat preservation barrel is moved through the