The key of accurate fault diagnosis of shield machine equipment is the real-time online vibration monitoring to their critical components.The measuring points were arranged at proper position of the parts,then multi-channel vibration data collectors were designed.Combining with the designed software interface in view of the system functional requirements,on-line vibration monitoring system of the shield equipment was set up.It could realize data analysis,health assessment,fault reasoning,maintenance decision,etc.With these functions,it was convenient for workers to know the operational status of key components well.The measurements of the monitoring system were done in shield laboratory.It is indicated the every function of the online monitoring system is normal and stable.