The invention relates to a destressing method for an amorphous alloy three-dimensional reel iron core. The destressing method is performed in a distressing device of the amorphous alloy three-dimensional reel iron core. After the amorphous alloy three-dimensional reel iron core is hung in the destressing device, the whole amorphous alloy three-dimensional reel iron core can be knocked on with a rubber hammer, so that the residual stress of the amorphous alloy three-dimensional reel iron core can be effectively removed, the performance of the amorphous alloy three-dimensional reel iron core is improved, and the influence of destressing knock on the structure of the amorphous alloy three-dimensional reel iron core is reduced.