Paper feeding device of digital printer

The invention provides a paper feeding device of a digital printer. The paper feeding device of the digital printer comprises a machine shell, a paper stack lifting mechanism, an air-blowing paper distributing mechanism and a negative-pressure belt conveying mechanism, wherein the paper stack lifting mechanism, the air-blowing paper distributing mechanism and the negative-pressure belt conveying mechanism are assembled on the machine shell. A paper outlet is formed in one side of the machine shell, the side where the paper outlet is located serves as the front side, and a first blower nozzle is formed in the side face of the machine shell. The paper stack lifting mechanism comprises a paper feeding table suitable for containing paper stacks and a matched lifting driving assembly. The air blowing paper separating mechanism comprises a first air blower, and the air outlet end of the first air blower faces the first air blowing opening; the negative pressure belt conveying mechanism is arranged above the paper f