Provided in the embodiments of the present application are a method and device for monitoring network data. The method comprises: a NWDAF determines a terminal UE to be monitored that requires network data analysis and the type of data analysis for the UE to be monitored; the NWDAF determines a provider network function network element and a monitoring event which correspond to the UE to be monitored according to the type of data analysis for the UE to be monitored, the provider network function network element being used to provide source data for the UE to be monitored which is related to the data analysis type, and the monitoring event being used to indicate to the provider network function network element to monitor the source data; and the NWDAF sends the monitoring event to the provider network function network element.