High-adaptability automatic crawling device for construction of outer protective layer of bridge steel cable

The invention discloses a high-adaptability automatic crawling device for construction of an outer protective layer of a bridge steel cable. A crawling part is of a cylindrical structure and arranged on the outer side of an inhaul cable in a sleeving mode, and crawling along the inhaul cable can be achieved; a rotating part is of a cylindrical structure, arranged on the outer side of the inhaul cable in a sleeving mode and located below the crawling part; the top of a rotating part is rotationally connected with the bottom of the crawling part; and a driving part is installed on the outer side of the crawling part and used for achieving wriggling driving of the crawling part and rotating driving of the rotating part. The structural form that the crawling part and the rotating part are matched is adopted, crawling driving is conducted through the crawling part, the stability of crawling along the steel cable is guaranteed, the rotating part provides the rotating function, meanwhile, the guiding function is ach