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In response to the demand for the acquisition of vibration signals of some large-scale and complex equipment, the measurement and control scenarios need to achieve simultaneous measurement of vibration signals of hundreds of channels. However, it is difficult for a single acquisition instrument to meet the requirements of a hundred-channel test. Therefore, an expandable multi-channel vibration signal acquisition and analysis system is developed in this paper. The system adopts the LXI bus architecture, and its host computer and equipment and its equipment all use LAN for data communication. The vibration measurement module uses a large dynamic range data acquisition technology, and the main control system software adopts a distributed data management mode. Finally, the main control computer reasonably regulates the parameters of the acquisition module through the communication protocol in the form of the instrument drive function, and can obtain the fault diagnosis result of the vibration signal through comprehensive data analysis. Through the vibration signal collection and data analysis of the axle box bearing of a certain type of high-speed train, it is found that a certain bearing has a fault, which verifies the validity of the designed test system.