Railroad vehicle bearing fault on-line measuring device and method

The present invention provides a kind of railroad vehicle bearing fault on-line measuring device and method, including: low noise track, it is positioned on the path of railroad vehicle process to be detected；Vibrating sensing module, including at least one vibrating sensor unit and signal output part, vibrating sensing module is positioned on low noise track；Microphone module, including at least one microphone unit and signal output part, microphone module is positioned at low noise track side and the position near vibrating sensing module；Data processing module, including signal input part and signal output part；The signal input part of data processing module is connected with the signal output part of vibrating sensing module and the signal output part of microphone module.The present invention can effectively promote bearing fault detection rate, reduces the probability that bearing fault is failed to report.