Protection device for tower crane

The utility model discloses a protective device for a tower crane. Oil storage barrel, an oil tank cover is in threaded connection with the oil storage barrel; one end of the oil tank cover close to the oil storage barrel is fixedly connected with a gasket; a circular hole is formed in the center of the oil tank cover; a through hole is formed in the oil storage barrel; ropes are inserted into thecircular holes and the through holes; an oil storage layer is arranged in the oil storage barrel; the top of the inner wall of the oil storage barrel is fixedly connected with an oil-isolating layer;the bottom end of the oil separation layer is fixedly connected with the oil storage barrel; multiple springs are fixedly connected to one side, away from the oil storage layer, of the oil separationlayer; according to the utility model, the device is fixed on a tower crane supporting arm near a rope through the flange plate; the ropes are inserted into the round holes and the through holes in apenetrating mode to slide,