Temperature cascade layered weld tempering device

The utility model discloses a temperature cascade layered weld tempering device which comprises a tempering heat insulation box and heating mechanisms, wherein the tempering heat insulation box comprises a box body, a box cover and a heat insulation layer; the heating mechanisms are placed at the bottom of an inner cavity of the box body; the heat insulation layer is placed in the inner cavity of the box body and located on the heating mechanisms; and the heat insulation layer is formed by stacking heat insulation particles. The device meets heat insulation tempering requirements of different parts of a welded cutter through cascade temperature distribution in the heat insulation box, effectively prevents a blade from cracking, allows a rejection rate to be less than 2%, reduces the thickness of the blade to a half of the original thickness, and effectively lowers the cost of the cutter.