The invention discloses a dust scraping device for a conveyer belt of a cloth drying machine. The dust scraping device comprises a scraper plate mechanism, a dust discharge mechanism and a vibration mechanism; the scraper plate mechanism comprises two transmission chain wheels, a chain tensioned on the two transmission chain wheels and a plurality of scraper plate parts which are evenly hinged to the chain, each scraper plate part comprises a scraper plate of which the end is closely attached to the outer wall face of the conveyer belt, a dust receiving plate which is vertically fixed to the lower end of the scraper plate and located under the conveyer belt and a rotating shaft which is fixedly inserted into the dust receiving plate in a sleeved mode, wherein one end of the rotating shaft stretches out of the dust receiving plate and is provided with a gear ring part; the dust discharge mechanism comprises a support plate, a rack part fixed to the support plate and a dust collecting box located under the scraper plate parts arranged on one side of the support plate; the vibration mechanism comprises an eccentric wheel arranged under the dust receiving plates, a motor arranged at one side of the eccentric wheel and a transmission belt connecting the motor with the eccentric wheel. According to the device, batting and dust which adhere to the outer wall of the conveyer belt in the cloth drying process can be automatically scraped and discharged without needing shutdown processing, and the production efficiency is high.