Portable automatic blood pressure measuring device based on double-gear adjustment

The utility model relates to a portable automatic blood pressure measuring device based on double-gear adjustment, which is characterized in that a motor drives a worm, a reduction gear box and driving gear shafts to rotate, and the two gear shafts are respectively provided with a synchronous gear for meshing, so that the two gear shafts synchronously rotate, two ends of a gear belt synchronously contract, and the positions of an air bag and an auscultation head are ensured; and meanwhile, the self-locking characteristic of the worm is utilized, locking is carried out at any time, and the structure is simple. An air bag measuring assembly and an auscultation head assembly are assembled, a Korotkoff sound method is combined with an oscillography, and a result more accurate than that of a common single method can be achieved. The gearbox is highly integrated, is miniaturized and is combined into a single shell assembly, so that the whole product is small in size, free of a sleeve strap, high in portability and