Permanent magnet sintering material box and material stacking method

A permanent magnet sintering material box consists of a box body and a box cover and is characterized in that the material box is made of tinplate. When the permanent magnet sintering material box is used for stacking materials, the sintering material box is used as an inner side material box, a material box which has the same shape as the inner side material box and a slightly larger size than the inner side material box is used as an outer side material box, and the inner side material box is placed in the outer side material box to form a double-layer material box for use. According to the permanent magnet sintering material box, the problem of sealing of the material box is solved, the problem of oxidation of sintered nd-fe-b pressed blanks during a storage process before entering a sintering furnace can be effectively prevented, and meanwhile, full air venting can be achieved during a high-temperature air venting phase; when the permanent magnet sintering material box is used for stacking the sintered nd-fe-b pressed blanks and performing high-temperature sintering aging, consistence of magnet performance is greatly improved, an oxygen content in a magnet is low, and an oxidation ratio is greatly reduced.