The invention discloses an SCADA system-based information monitoring system and a monitoring method thereof. The monitoring system acquires production data and fault alarms in real time through an SCADA server. After that, the data are filtered and analyzed by means of a scheduling server, and the time and contacts are classified to correspond to each other at the same time. According to the demands of different users, the contents of short messages are customized. Then, the data are connected with a database in the ODBC manner and stored in the database in a fixed format. Finally, the software used for simulating the action of a mouse and the action of a keyboard is arranged to periodically and circularly scan the database. Therefore, whether the information needs to be updated or not can be judged. The updated information content is automatically input to the third-party chat software, and then is sent to the handsets of contacts in the form of free short messages by the third-party chat software. According to the technical scheme of the invention, the fault alarm information is sent in real time, and production data can be periodically sent to the handsets of associated people. Therefore, the current operating condition of the system can be monitored at any time. The system is low in cost.