The utility model relates to a diaphragm type pressure gauges, be equipped with a bow type support body in, including a manometer, its below group is equipped with a supporter, and combines to have a diaphragm among them, and this supporter bottom is equipped with a double -screw bolt to run through being equipped with a test channel, make the tester mobile in among them, attach the diaphragm the same with this diaphragm shape under this diaphragm, and respectively be equipped with the bump about the diaphragm edge, establish diaphragm and supporter in order to support, and be equipped with explosion -proof piece on the diaphragm, and this supporter and double -screw bolt are integrated into one piece's design, during implementation, the measuring pressure through test channel propelling movement diaphragm upwards to carry out the parameter demonstration to establishing the diaphragm, and have explosion -proof piece to dash the damage in order to prevent to explode above the diaphragm, and the contact of measuring pressure is kept apart to the warp diaphragm the same with the diaphragm shape, makes it can avoid getting rusty the phenomenon, and further reach the application that the food level was tested.