Crucible preparation method and crucible

The invention provides a preparation method of a crucible and the crucible, and relates to the technical field of monocrystalline silicon preparation. The preparation method of the crucible comprises the following steps: paving at least two layers of quartz sand in a mold to obtain a founding precursor; in the outer-layer sand located on the outermost layer of the founding precursor, the mass ratio of the quartz sand with the particle size of 500-2000 microns is larger than or equal to 90%; melting the melting precursor; in the melting process, the quartz sand close to the axis of the mold is melted to form a transparent layer of the crucible, and part of the outer-layer sand and the quartz sand located between part of the outer-layer sand and the transparent layer are melted to form a bubble layer of the crucible; the thickness h1 of the molten outer-layer sand in the bubble layer is smaller than or equal to a first preset thickness, and the outer wall of the crucible is a wall body, away from the transparen