Quartz ceramic crucible

The utility model discloses a quartz ceramic crucible. The quartz ceramic crucible comprises a bottom and side walls which are integrally molded, wherein the thickness of the bottom is 18-45mm; and a plurality of convex parts or concave parts are arranged on the inner surface of the bottom. According to the structural design of the inner surface of the bottom of the quartz ceramic crucible, the nethermost surface of the bottom of the crucible becomes a low-temperature point; and the temperature gradient direction of each low-temperature point is perpendicular to the inner bottom surface of the crucible, so that all initially grown crystals are parallel to one another instead without intersecting with one another, and the formation and turbulence of crystal boundaries can be reduced. The initial crystals grow along an original direction and become thicker and bigger gradually, so that a thick and big polysilicon crystal with good directionality can be obtained, the formation of the crystal boundaries is optimi