The present invention provides a system and a method for business data monitoring of an electric energy quality on-line monitoring system. The method comprises the steps that: a transmission monitoring module monitors data in a database in the electric energy quality on-line monitoring system, and if data is missed or is not accessed on time, data alarm information is generated; an intelligent decision module generates a triggering instruction according to the data alarm information, obtains data monitoring data and generates an operation instruction according to the data monitoring information; and an automatic maintenance module restarts the electric energy quality on-line monitoring system or re-extract business data to the electric energy quality on-line monitoring system according tothe operation instruction. The system and the method for business data monitoring of the electric energy quality on-line monitoring system ensure the timeliness and the integrity of business data transmission of the electric energy quality on-line monitoring system, can intelligently determine business data transmission alarm reasons and make automatic operation and do not need human involvement in a whole process, and therefore, the efficiency and the intelligence of business data operation and maintenance can be improved, and the operation and maintenance workload is reduced to the maximum extent.