Pressurizing testing system and method

The invention belongs to the field of equipment testing, and discloses a pressurizing testing system for solving the problem of pressure diaphragm capsule and capillary tube damage caused by instable pressurizing when a conventional testing method is adopted for pressurizing testing of an internal pressure detection device for a containing vessel in an AP1000 nuclear power plant. The pressurizing testing system comprises a pressure source and a buffer tank, wherein the outlet end of the pressure source is connected with the inlet end of the buffer tank, and the outlet end of the buffer tank is connected with a pressure diaphragm capsule; a tee joint is arranged at the outlet end of the buffer tank, a first end opening of the tee joint is communicated with the outlet end of the buffer tank, a second end opening is connected with the pressure detection surface of the pressure diaphragm capsule and a third end opening is connected with an oil filling opening of the pressure diaphragm capsule. When the pressurizi