Double-cylinder diaphragm vacuum pump

The invention provides a double-cylinder diaphragm vacuum pump. The double-cylinder diaphragm vacuum pump comprises a pump body, a pump cover, a sealing ring, a diaphragm assembly, a connecting rod, a fastening bolt, a connecting rod cover and a motor assembly; a motor shaft of the motor assembly is provided with a crankshaft-imitated section; the whole connecting rod is in a Y shape, one end of the connecting rod is a straight rod and is fixedly connected with an internal thread on a diaphragm through an external thread to form an integral part, the other end of the connecting rod is a fork-shaped part with an arc-shaped groove, and two threaded holes are formed in the end face of the fork-shaped part; the whole connecting rod cover is semicircular, and two bolt through holes are formed in the connecting rod cover; and the fork-shaped part of the connecting rod and the connecting rod cover enclose the crankshaft-imitated section of the motor shaft from two sides correspondingly and are connected into an annu