Testing system for testing fatigue life of diaphragm capsule bearing alternating pressure

A testing system for testing the fatigue life of a diaphragm capsule bearing alternating pressure comprises a diaphragm capsule assembly installation seat (2), a high-pressure pipeline (10), a low-pressure pipeline (11) and the like, wherein a pressure bearing cavity (14) is commonly formed among an outer barrel and an inner barrel of the diaphragm capsule installation seat (2) and a diaphragm capsule assembly (1); connecting openings which are communicated with the pressure bearing cavity (14) are formed in the side wall of the outer barrel of the diaphragm capsule installation seat (2); each connecting opening is respectively connected with the high-pressure pipeline (10), the low-pressure pipeline (11) and a first pressure sensor (8); the high-pressure pipeline (10) is provided with a first electromagnetic valve (4) and is connected with a high-pressure air source through a high-pressure air inlet (12); the low-pressure pipeline (11) is provided with a second electromagnetic valve (5) and a pressure stabil