The invention discloses a pneumatic air pump. The pneumatic air pump comprises an air compressor and a vacuum valve which are connected with each other, wherein a first air inlet and a second air inlet are formed in one side of the vacuum valve, and the other side of the vacuum valve is provided with an air blowing opening and an air suction opening; the first air inlet and the second air inlet are both connected with the air compressor; a first channel structure, a second channel structure and air suction pipelines are arranged in the vacuum valve; the first channel structure is used for connecting the first air inlet with the air blowing port; the second air inlet and the air suction pipelines are all connected with the second channel structure; angles between the air suction pipelines and the second channel structure are acute angles; and ends, far away from the second channel structure, of the air suction pipelines are connected with the air suction port. According to the pneumaticair pump, the common air compressor is directly used for being connected with the vacuum valve so as to carry out air blowing and air suction on a paper conveying feeder, and therefore production cost is greatly reduced.