Connecting piece for connecting shoulder strap and bag

The utility model provides a connecting piece for connecting a shoulder strap and a bag. The connecting piece comprises a first connecting block and a second connecting block, the first connecting block and the second connecting block are connected through a connecting piece; the connecting piece comprises a connecting plate fixedly connected with the first connecting block and a notch formed in the second connecting block; the connecting plate is arranged in the notch; a second notch is formed in the second connecting block; a rack plate is slidably connected into the second notch through a sliding assembly. A third notch communicated with the second notch is formed in the second connecting block; a gear meshed with the rack plate is arranged in the third notch; the gear is rotationally connected with the second connecting block through a rotating shaft; the other end of the rotating shaft is fixedly connected with a second gear arranged in the notch; the left end and the right end of the second gear are eng