▎ 摘　　要

NOVELTY - The utility model claims a constant temperature device for crystal growth, comprising a base, the middle part of the base is provided with an outer cylinder, the outer cylinder body is provided with an inner cylinder, the inner cylinder body is provided with a crucible, the inner cylinder is located below the crucible is provided with an electric heating pipe, the outer side of the electric heating pipe is filled with graphene, the lower part of the graphene is filled with insulating sand, the upper part of the outer cylinder is provided with a cover body, the cover body is connected with the inner cylinder screw thread, the middle part of the cover body is provided with a connecting groove, the connecting groove is provided with a connecting block, the lower end of the connecting block is connected with the connecting groove screw thread the cover body is located below the connecting groove and is provided with a straight slot the lower part of the connecting block is fixedly connected with the seed crystal rod, the lower end of the seed crystal rod is fixedly connected with the seed straight slot. The constant temperature device has simple structure, convenient operation, good heat preservation effect, temperature and pressure are convenient to control, which effectively improves the production efficiency of the crystal and reduces the production cost.