Abstract: Provided are a cloud platform-based comprehensive line network monitoring method and system. Device state data of each line is acquired, and stored in a monitoring platform and a data platform that are built on a cloud platform. The monitoring platform can only store only the latest device state data, perform data monitoring processing on the device state data to obtain real-time monitoring data, and transmit corresponding real-time monitoring data to a client at an application layer based on a data subscription demand of the client, to allow the client to perform real-time device monitoring processing based on the real-time monitoring data. Also, the data platform can provide, in response to a historical data application request sent by the client, the device state data to the client as historical statistical analysis data, to allow the client to perform historical state monitoring processing based on the historical statistical analysis data.