The invention discloses a lithium battery powder supplying device which comprises a liquid delivery mechanism, a powder supplying mechanism and a centrifugal mixing mechanism. The centrifugal mixing mechanism is respectively connected with the liquid delivery mechanism and the powder supplying mechanism and can enable liquid delivered by the liquid delivery mechanism and powder delivered by the powder supplying mechanism to be mixed and output. The lithium battery powder supplying device is reasonable in structural design, high in reliability and capable of quickly and quantitatively delivering the powder. When the device works and the liquid flows into a mixing portion through a water inlet portion, a material inlet portion produces negative pressure to enable the powder to be sucked into the mixing portion, even mixing and outputting of the liquid and powder are achieved, the automation degree is high, the labor intensity is effectively reduced, and the production efficiency is improved. In addition, raise dust loss of the powder is not caused, and production environment pollution can be effectively avoided. Furthermore, the lithium battery powder supplying device is simple in whole structure, high in stability, safe, reliable, long in service and suitable for wide popularization and application.