Urban sewer pipeline anti-corrosion process method

The invention discloses an urban sewer pipeline anti-corrosion process method. A liquid spraying device in the method comprises a bottom plate, supporting plates are arranged at the positions, close to the front side and the rear side, of the top of the bottom plate, two power rollers are arranged at the top of the bottom plate, and the distance between the two power rollers gradually increases towards the top, and a slicking and spraying device is connected to the tops of the two supporting plates in an inserted mode. Before a spray head sprays liquid, the inner wall of a sewer pipeline is scraped by a scraper, so that the anti-corrosion treatment effect is ensured; then, cleaned objects scraped by the scraper can be gathered on the surface of the scraper, a part of the cleaned objects can enter a bearing frame formed by sinking the middle of the scraper downwards, the height of the bottom of the inner side of the bearing frame gradually becomes smaller from the middle to the front side and the rear side, an