Scraper coal feeder is used for conveying coal in power plant and feeding coal to boiler. It belongs to En masse conveyor, which is a continuous conveyor equipment in the case type rectangular section shell body with moving scraping chain. For the simple structure, it not only can transfer in horizontal but also on slope and in vertical. At the same time, if in combined disposal, it could case more material and discharge more. Because of the closed casing type shell body, it could improve working conditions and prevent the pollution of the environment.