The present invention relates to a toner replenishing mechanism for a toner
cartridge, comprising a toner
cartridge body having a toner bin, and a
powder replenishing box matched and docked above the toner bin, wherein a
powder inlet is arranged on the docking surface of the toner bin, and a
powder outlet opposite to the powder inlet is arranged on the docking surface of the powder replenishing box; a powder outlet
assembly for bringing toner to the powder outlet is arranged in the powder replenishing box, and the powder outlet
assembly is connected to a motion mechanism in the toner
cartridge body through a reduction gear set. The toner cartridge toner replenishing mechanism facilitates the powder replenishing operation and can effectively control the powder supply quality and powder supply amount.