The invention belongs to the field of sealing ring detection equipment, and particularly relates to a sealing ring nondestructive rated pressure detector which comprises a shell, a pressure testing shaft, a blockage module, a compression module, a support, a quick joint, a first pressure meter, electromagnetic valves, second pressure meters and an oil discharging pipe. The shell is of a cylindrical structure, a plurality of layers of liquid outgoing holes are symmetrically formed in the side wall of the shell, each liquid outgoing hole is externally connected with the oil discharging pipe, each electromagnetic valve and the corresponding second pressure meter are mounted on the corresponding oil discharging pipe, the quick joint for a high-pressure hose to be connected with is arranged atthe bottom of the shell, and the first pressure meter is arranged on the side face of the quick joint; the pressure testing shaft sleeves in the shell and is used for placement of sealing rings to bedetected, the blockage module is mounted in the pressure testing shaft and used for detecting the sealing rings one by one, and the compression module is positioned above the pressure testing shaft and used for pressing the pressure testing shaft into the shell. The sealing ring nondestructive rated pressure detector can directly detect whether the sealing rings can reach rated pressure or not andis simple and convenient in operation and visual and accurate in testing result.