The utility model provides a state monitoring system of wind turbine generator, include: monitoring module at the bottom of the tower can be given with the information that reflects wind wheel and cabin state and data output to wind wheel cabin monitoring module, the reflection wind wheel of wind wheel cabin monitoring module output and the information and the data of cabin state are received to monitoring module at the bottom of the tower to the information and the data output that will reflect state at the bottom of wind wheel, cabin and the tower give the server, the server, the informationand the data of state at the bottom of the monitoring module sent at the bottom of receipt and the assay tower reflection wind wheel, cabin and the tower to control command is sent for monitoring module at the bottom of the tower with analysis result to information and data according to reflection state at the bottom of wind wheel, cabin and the tower, this kind of state monitoring system of windturbine generator can optimize human and material resources configuration, the material resources of using manpower sparingly effectively economic cost.