Parallel-plate dry-type capacitive pressure sensor

By using a parallel-plate dry-type capacitive pressure sensor, problems that an existing sensor making technology requirement is difficult; a precision measurement and control pressure requirement is not easy to satisfy; a yield is low and so on are solved. The sensor comprises a shell, a plane-plate-type fixed electrode in an assembling shell and a moving electrode. The sensor is characterized in that a sapphire insulator of the moving electrode is fixedly connected to a welding block through a silver copper brazing layer, and a bottom surface of the insulator is plated with a plane metal electrode and an insulating layer in a vacuum mode; the moving electrode formed through fixing a membrane and a whole bottom surface of an electrode plate and the fixed electrode are arranged in a parallel mode in a cavity formed through sealing a support sleeve and a connection seat, and the support sleeve and the connection seat are contacted with upper and lower crests of a membrane edge ripple respectively; and components are welded through cutting edges. The structure is designed reasonably, a making technology is simple, material sources are wide, processing quality is good and parallel plate electrode linearity is good. Compared to a same kind of products, the sensor of the invention has high measuring range precision by using the membrane with the same thickness, earthquake-proof performance is stable and corrosion resisting performance is possessed. Production efficiency and a service life are greatly increased and prolonged, and making cost is reduced.