Abstract: A grinding mixer includes a casing supported on a base, an auger stirrer projected into the casing and driven to rotate on its own axis by a motor through a reducing gear set, a toothed disk having downward teeth along its circular peripheral edge in mesh with the reducing gear set, wherein rotating the motor causes the auger stirrer to revolve on its own axis, and simultaneously causes the reducing gear to carry the auger stirrer along the circular peripheral edge of the toothed disk so as to mix materials well. The auger stirrer has a unitary grinding plate on the bottom for grinding materials to powder as it is rotated to mix materials. A scraper blade is carried by the reducing gear to scrape the inside surface of the casing as the auger stirrer is rotated to grind and mix materials.