The utility model discloses a pneumatic door opening mechanism of a side-by-side combination refrigerator. The pneumatic door opening mechanism of the side-by-side combination refrigerator comprises a fixing and connecting device, two door opening connecting rods, a connecting hinge, a guide rail, a sliding block, connecting rods, a cylinder and the like, wherein the connecting hinge and the door opening connecting rods are fixedly connected, the connecting rods are movably hinged to the door opening connecting rods, the connecting hinge is movably hinged to the fixing and connecting device, the central line of a pin through which the connecting hinge is movably hinged to the fixing and connecting device and the central line of a pin hinge shaft of a refrigerator hinge are located on the same straight line, one end of the sliding block is connected with the two connecting rods, the other end of the sliding block is fixedly connected with a piston rod, the piston rod is connected with a piston in the cylinder, and the piston rod and the sliding block are driven by the cylinder to move. The pneumatic door opening mechanism of the side-by-side combination refrigerator has the advantages of being capable of achieving automatic repeated opening and closing of two doors of the side-by-side combination refrigerator and improving the refrigerator testing efficiency, simple in structure, easy to obtain, low in manufacturing cost and the like.