Steel wire ring-wedged anti-theft nut

The utility model provides a steel wire ring-wedged anti-theft nut which relates to the field of metal part processing and aims to solves the problem that the prior fastener (such as bolt or nut) is extremely easy to disassemble and doesn't meet the special requirement for theft protection of the outdoor equipment. The steel wire ring-wedged anti-theft nut comprises a round nut (1), a casing (2), a steel wire ring (3) and an auxiliary part (4), wherein a ring-shaped recess (7) is arranged at the middle part of the outer wall of the round nut (1), chamfers (8) are arranged on the inner side of the upper and the lower end surfaces of the round nut, the casing (2) is circular ring-shaped, the circular upper edge of the casing is partially folded inwards at a right angle and the folded part is embedded inside the ring-shaped recess (7) of the round nut (1), the circular lower edge of the casing is partially folded inwards at a right angle and the top end of the folded part is folded upwards at an acute angle, int