The invention discloses a novel rod-breakage preventing nut. The novel rod-breakage preventing nut comprises a nut body, a nut movable plate and an elastic body. The nut movable plate is coaxially arranged outside the end, provided with a flange part, of the nut body. The middle portion of the nut movable plate is provided with an inner hole, and the hole diameter of the inner hole is larger thanthe hole diameter of a bolt hole of the nut body. The nut movable plate is provided with a body part, an axial bending part and a radial bending part. A containing cavity is defined jointly by the endface of the end, provided with the flange part, of the nut body, the inner side face of the axial bending part, the inner side face of the body part, the inner hole peripheral edge of the nut movableplate, the corresponding extending face of the outer side face of the body part and the axial extending face of the bolt hole edge of the nut body, and the elastic body is loaded into the containingcavity. When the novel rod-breakage preventing nut is used and a fastened object is subjected to the action of external force, the nut movable plate immediately drives the elastic body to carry out energy conversion, the external force is eliminated, a bolt in the nut is protected against rod breakage, and the fastened object is locked tightly.