The invention discloses a scraper apparatus of a coating machine, the apparatus comprises a scrape knife component, a cis scraper assembly and a dilution material supply apparatus, an elastic steel disc scraper and a clutch operating mechanism 1 are arranged on the scrape knife component for first scraping, a plastic sheet thick scraper and a clutch operating mechanism 2 are arranged on the cis scraper assembly for secondary supplement scraping, the dilution material supply apparatus employs a gear pump for circularly providing the dilution material, the bottom roller surface after first scraping is fully moistened, the dilution material supply apparatus is in favor of thoroughly secondary scraping of the bottom roller surface, the surface can be completely scraped, thereby the next iron sheet painting can be carried out in a reliable mode, so that the efficiency can be increased, and the production cost is increased.