The invention provides a sintering device for a magnetic steel blank. According to the sintering device for the magnetic steel blank, a main stay rod is adopted to hang a main sintering kettle and a deputy stay rod is adopted to hang a deputy sintering kettle and a driven sintering kettle; the deputy stay rod is arranged on a moving supporting plate which can be moved based on sizes of the main sintering kettle, the deputy sintering kettle and the driven sintering kettle, so that the main sintering kettle, the deputy sintering kettle and the driven sintering kettle can be tightly jogged, thereby fully using the device space; and multiple sintering kettles are operated at the same time, so that time is saved, and the work efficiency is improved.