Single crystal furnace

The utility model discloses a single crystal furnace, which comprises a furnace body, a growth crucible, a cooling jacket, a heating component and a first heat insulation component, an interlayer is arranged on the inner wall of the furnace body, a cooling channel is arranged in the interlayer, and cooling water is filled in the cooling channel; the growth crucible is arranged in the furnace body, a containing cavity is defined in the growth crucible, and the top side of the containing cavity is open; the cooling sleeve is arranged in the furnace body, is positioned on the right upper side of the accommodating cavity and is used for cooling the crystal; a second heat insulation assembly is arranged at the end, close to the growth crucible, of the cooling sleeve; the heating assembly is arranged in the furnace body and is used for heating the growth crucible; the first heat insulation assembly is arranged in the furnace body and surrounds the heating assembly. According to the utility model, the furnace body c