To prevent adhesion of a powder to the inner wall surface of a grinding container of a powder grinding machine. A powder grinding machine 10 which is provided with: a hermetically sealed grinding container 20; a powder introduction mechanism 30 which has a feed port 31a that is opened to the inside of the grinding container 20, and which introduces a powder to be ground to the feed port 31a; a powder grinding mechanism 40 which is positioned below the feed port 31a within the grinding container 20 and grinds the powder by having a high-pressure air hit the powder; and a classification device 50 which is positioned above the feed port 31a within the grinding container 20 and leads out the ground powder to the outside of the grinding container 20, while sorting out the ground powder. An inner wall surface 20a of the grinding container 20 is covered by porous lining materials 60A, 60B; and each pore 65 of the lining materials 60A, 60B is in communication with an air supply device 62 through gaps 61A, 61B between the inner wall surface 20a and the lining materials 60A, 60B.