The feeder consists of a rotatable disc, a guide sleeve and a scraper. The material in the silo is deposited on the disc with the wear-resistant lining through the guide sleeve, and the disc is rotated, and the material is scraped out of the feed by the scraper. Adjusting the position of the squeegee or the height of the guide sleeve changes the amount of feed. The diameter of the disc is generally less than 3 meters and the rotation speed is not more than 10 rpm. The disc feeder operates smoothly and reliably. It is convenient to adjust the feeding amount and consume less energy. However, the structure is relatively bulky and suitable for powdery and granular materials with less viscosity.