Combined lock nut

The utility model relates to the technical field of combined nuts, in particular to a combined locknut which comprises a lower connecting nut, the top of the lower connecting nut is connected with a connecting piece, the top of the connecting piece is connected with an upper connecting nut, and the outer end of the lower connecting nut and the outer end of the upper connecting nut are connected with a locking structure. The interiors of the lower connecting nut and the upper connecting nut are connected with a screw rod, the outer end, located on one side of the lower connecting nut and one side of the upper connecting nut, of the screw rod is connected with a connecting disc, an anti-loosening structure is used for being connected with the external screw rod, and the long-term anti-loosening effect on the combined nut can be achieved; the hidden danger that the combined nut is loosened after being used for a long time is avoided, and practicability is improved. 本实用新型涉及组合螺母技术领域，具体为一种组合防松螺母，包括下连接螺母，所述下连接螺母的顶部连