Crucible for synthesizing silicon carbide powder as well as preparation method and synthesis device of crucible

The invention provides a crucible for synthesizing silicon carbide powder as well as a preparation method and a synthesis device of the crucible. The crucible comprises a crucible body and a heat insulation chamber; the upper end of the crucible body is open, and the lower end is sealed to form a containing cavity; the heat insulation chamber is arranged at the bottom of the crucible body, the heat insulation chamber and the crucible body are of an integrated structure, and a heat insulation cavity is formed in the heat insulation chamber. According to the crucible for synthesizing the silicon carbide powder, the heat insulation chamber integrated with the crucible body is arranged at the bottom of the crucible body, and the heat insulation cavity is formed in the heat insulation chamber; when the crucible is used for synthesizing high-purity carbon powder and high-purity silicon powder into silicon carbide powder at a high temperature, the heat insulation cavity can play a certain heat insulation role, the t