Anti-falling joint of underground casing scraper

The utility model discloses an anti-drop joint of an underground casing scraper, which comprises a scraper body, a screwed joint and a scraping body, and further comprises an anti-drop mechanism, the anti-drop mechanism comprises a fixed slot, a lantern ring, a fixed insertion plate, a C cover plate, a C cover side plate and a rough grinding surface wall, the screwed joint is formed on the head of one end of the scraper body through turning, and the fixed insertion plate is connected with the fixed insertion plate. A scraping body is installed on the surface of the scraper body, an anti-disengaging mechanism used when the scraper body is connected with a drill rod is arranged at the position of the scraper body used for the underground casing pipe, and the anti-disengaging mechanism enables the scraper body and the drill rod to be in screwed connection and further to be provided with a positioning limiting structure with an outer cover welded in a micro-spot mode. And meanwhile, a welding structure of the ant