Demolition system for ultrahigh inner support of deep foundation pit

The utility model discloses a demolition system for an ultrahigh inner support of a deep foundation pit. The demolition system comprises a hoisting device, a suspension fixing mechanism for fixing the hoisting device, a steel wire rope, a rope saw cutting machine, a perforating machine and a transfer device, the transferring device is used for receiving the cut ultrahigh inner support hoisted by the hoisting device and transferring the ultrahigh inner support to the ground, the rope saw cutting machine is used for cutting and separating the ultrahigh inner support, the punching device is used for punching holes in the ultrahigh inner support and the suspension fixing mechanism, and the hoisting device is suspended below the suspension fixing mechanism through a steel wire rope. The lower end of the steel wire rope binds the ultrahigh inner support cutting part; the upper end of the steel wire rope is fixedly connected with the hoisting device. The problems that due to the fact that the height difference betwe