Limiting device suitable for four-rope grab crane

The invention discloses a limiting device suitable for a four-rope grab crane, which comprises a mounting block, extension frames arranged on the two sides of the mounting block, and a bottom plate arranged at the bottom of the mounting block, and further comprises a limiting unit which comprises a take-up and pay-off mechanism rotationally arranged on the inner sides of the extension frames and used for winding a steel wire rope, the rope arranging mechanism is arranged on one side of the winding and unwinding mechanism and used for conducting rope arranging work on the steel wire rope when the steel wire rope is wound and unwound, the push rod is arranged in the rope arranging mechanism and used for pushing the rope arranging mechanism to conduct feeding, and a thread line is arranged on the outer side of the push rod. The driving unit synchronously drives the push rod and the winding and unwinding mechanism to rotate, the winding and unwinding mechanism winds the steel wire rope, meanwhile, the push rod dr