The invention belongs to the technical field of solar cell preparation. The invention discloses a graphite boat for coating silicon wafer of solar cell, which comprises a graphite boat leaf, a ceramicfixing column, a graphite fixing block and a graphite nut. The upper and lower edges of the graphite boat leaves are respectively provided with a row of fixing holes, and the ceramic fixing columns fix a plurality of graphite boat leaves together through the fixing holes; The graphite fixing block is arranged at the two ends of the graphite naval blade, and the graphite nut is arranged at the twoends of the ceramic fixing column and the graphite fixing block. A support re is arranged on that ceramic fix column to support adjacent graphite boat sheets. The invention is not only applicable toconventional single-crystal and polycrystalline processes, but also applicable to the popular single-crystal and polycrystalline PERC batteries, black silicon battery processes and the like. By usingthe patented technology of the invention, the occurrence of the collapse point and the fragment can be greatly reduced; The patented technology of the invention is simple, convenient to operate, easyto operate without reforming equipment and the like, and easy to implement on a large scale.