The utility model belongs to the technical field of nuclear power owner pump overhaul, a main pump hydraulic component static pressure test device is related to, realize the static pressure test to main pump hydraulic component, the device includes: pump case strutting arrangement, pump case, main flange bolt nut, main flange backing ring, simulation pump shaft, upper portion seal assembly, main flange and lower part seal assembly, during the experiment of hydraulic component static pressure, hydraulic component sets up in the inside cavity of pump case, the fixed hydraulic component of flange face support on the pump case, and the two matching trim uses sealed the pad and seals, hydraulic component top main flange of installation and main flange backing ring compress tightly main flange assembly through main bolt and nut and compress tightly hydraulic component and pump case, realize the sealed of pressure -bearing border. The utility model discloses set up hydraulic component in the pump case, form thermal shielding RRI chamber and pump case chamber, can effectively realize hydraulic component's such as side low pressure test (LPT) of hydraulic component thermal shielding RRI and pump case high -voltage testing static pressure test fast, the utility model discloses simple structure, the hydraulic component static pressure test operation is simple and easy.