The public utility model, a powder mixer. The solution of the existing powder mixer power machine in the course of power loss, and its easy to damage the sealing device, operatives defects labor-intensive.Technical measures taken: A powder mixer, including the shell, located in the impeller shell, described by the solid impeller blade connected with the pivot of the composition, the outer shell in the above with power machine, the power machine through a shaft through the casing and the impeller is connected to the pivot, in the shaft and has a seal between the shell and its characteristics is described in the corresponding pivot seal one end with the end surface with several strips of the convex body