Circulating toner cartridge toner cleaning and replacing device and replacing method

The invention discloses a circulating toner cartridge powdered ink cleaning and replacing device which comprises a U-shaped replacing support and a carrier, and the replacing support is further provided with an overturning driving mechanism used for driving the carrier to rotate. The carrier comprises a first fixing seat, a second fixing seat and a connecting plate, the first fixing seat and the second fixing seat are connected between the two ends of the replacement support in a relatively rotating mode, the connecting plate is fixedly connected to the bottom of the first fixing seat and the bottom of the second fixing seat, and the first fixing seat and the second fixing seat are each provided with a containing groove matched with the outline of the bottom of the selenium drum; the locking mechanism is used for fixing the toner cartridge on the accommodating groove; the stirring driving mechanism is used for driving a toner stirring knife of the toner cartridge to rotate; the sealed toner pumping and replac