The invention relates to a regulation valve 
cavitation diagnosis 
system and method. A regulation valve testing pipeline 
system comprises a multistage 
centrifugal pump, a multistage 
centrifugal pump frequency changer, a to-be-tested regulation valve of a diagnosed object, an upstream stop valve, a downstream 
throttle valve and a 
system pipeline to be tested, wherein the multistage centrifugal pumpis used for providing 
relative pressure; the multistage 
centrifugal pump frequency changer is used for regulating the revolving speed of the multistage centrifugal pump; and the upstream stop valve and the downstream 
throttle valve are respectively arranged in front of and behind the to-be-tested regulation valve. According to the invention, through adopting the above technology, upstream pressurein front of the to-be-tested regulation valve, downstream pressure behind the to-be-tested regulation valve, Z-axis 
vibration acceleration behind the to-be-tested regulation valve and flow in front of the to-be-tested regulation valve are utilized for calculating and judging whether 
cavitation happens or not; through a 
cavitation diagnosis device, the cavitation parameters of the regulation valveunder a certain aperture are diagnosed, so that a condition for cavitation under a 
current regulation valve aperture can be accurately obtained, and the effectiveness value of the 
vibration acceleration, working condition parameters, cavitation parameters and cavitation severity coefficients can be solved, so that the cavitation 
diagnosis evaluation of the regulation valve is realized.