Lifting nut pair with wear detector

The invention discloses a lifting nut pair with a wear detector. A driving group comprises a driving nut, a driving bracket and a safety upper shifting fork, wherein the driving nut is installed on the driving bracket through a bolt; and the safety upper shifting fork is connected with the driving nut through a bolt. A driven group comprises a safety lower shifting fork, a safety nut and an electric appliance detection switch, wherein the safety lower shifting fork is connected with the safety nut through a bolt; the electric appliance detection switch is installed on the driving bracket; and the safety nut and the driving nut are indirectly connected with each other through the safety upper shifting fork and the safety lower shifting fork. The driving group and the driven group are installed on a lifting screw; and a clearance is left between the safety lower shifting fork and the safety nut. In the invention, the wear between the screw and the nuts is utilized to generate the clearance, and a proximity swit