The invention discloses a six-degree-of-freedom wideband integrated seismic monitoring system which at least comprises a sensor integration unit and a data fusion unit. The sensor integration unit comprises a GNSS receiver, a three-axis accelerator and a three-axis gyroscope which are arranged at a same sit and used for synchronously collecting GNSS observation data, acceleration observation dataand angular speed observation data and storing the same, the data fusion unit comprises a GNSS data positioning and processing module, an integrating, fusing and measuring data module and a comprehensive filter, the GNSS data positioning and processing module is used for positioning calculation according to the GNSS observation data, the integrating, fusing and measuring data module is used for fusing GNSS position information, the acceleration observation data and the angular speed observation data, and the comprehensive filter is used for calculating according to data after fusion. The system can realize single-station six-degree-of-freedom seismic monitoring, expand seismic monitoring bandwidth and improve seismic monitoring ability.