Nut of grooving anti-loose bolt and nut fastening connection device

A nut of a grooving anti-loose bolt and nut fastening connection device comprises a nut body. The nut body is of a cylinder structure with threaded holes formed in the middle in the axial direction, at least two threaded through holes are formed in the nut body in the axial direction and are evenly arranged in the circumferential direction of a center line of the nut body, and a puller bolt is in threaded connection with the inside of each threaded through hole. A groove close to the heads of the puller bolts is formed in the nut body in the radial direction, a threaded blind hole vertically penetrating the groove is formed in the nut body in the axial direction, and a fastening screw is in threaded connection with the inside of the threaded blind hole. The nut is scientific in principle, simple in structure, convenient to use, convenient to operate, wide in use aspect and capable of being used repeatedly, effectively reduces labor intensity of workers, and saves installation time. The nut is unique in fastening mode and can keep the tightening state even under strong shock, high temperature and high pressure. Looseness, releasing or stripping of common bolts are avoided.