The invention discloses a pneumatic door opening mechanism of a side-by-side combination refrigerator. The pneumatic door opening mechanism comprises a fixed connection device, two door opening connecting rods, connecting hinges, a guide rail, a slider, connecting rods, a cylinder and the like, wherein the connecting hinges and the door opening connecting rods are fixedly connected; the connecting rods and the door opening connecting rods are movably hinged; the connecting hinges and the fixed connection devices are movably hinged, and the central line of a dowel for movable hinging and the central line of a dowel hinged shaft of a refrigerator door hinge are located on the same straight line; one end of the slider is connected with the two connecting rods, and the other end of the slider is fixedly connected with a piston rod; and the piston rod is connected with a piston in the cylinder, and the piston rod and the slider are driven by the cylinder to move. The pneumatic door opening mechanism of the side-by-side combination refrigerator has the advantages that two doors of the side-by-side combination refrigerator can be opened and closed automatically and repeatedly, the refrigerator testing efficiency can be increased, the structure is simple and easy to achieve, the manufacture cost is low and the like.