The invention discloses an electric generator hydrogen system hydrogen whole-parameter integration online monitoring system. The system comprises an equipment cabinet. A through terminal disc, a highvoltage region monitoring pipeline, a low voltage region monitoring pipeline, a high point monitoring pipeline, a low point monitoring pipeline, an excavation pipeline and a hydrogen supplementing pipeline are arranged inside the equipment cabinet. A power supply source interface, a hydrogen leakage detecting signal output interface, a hydrogen leakage detecting probe input interface, a hydrogen pressure high alarm interface, a hydrogen pressure low alarm interface, a hydrogen pressure excessively-low alarm interface, an electric generator internal air pressure monitoring interface, a hydrogenhumidity signal interface, a hydrogen purity signal interface, a hydrogen oxygen signal interface and a differential pressure signal interface are arranged on the through terminal disc. The system has the advantages that monitoring parameters are comprehensive, the equipment integration degree is high, equipment is convenient to update and maintain, monitoring is sufficient, the system is easy tooperate and maintain, and fault analysis processing and integrated control of the system are facilitated.